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<!DOCTYPE html>
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<title>Chapter 2 Data organisation | Statistical Techniques for Biological and Environmental Sciences</title>
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<meta name="twitter:description" content="This is a minimal example of using the bookdown package to write a book. The output format for this example is bookdown::gitbook." />
<meta name="author" content="Brad Duthie" />
<meta name="date" content="2022-12-27" />
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<div class="book-summary">
<nav role="navigation">
<ul class="summary">
<li><a href="./">A Minimal Book Example</a></li>
<li class="divider"></li>
<li class="chapter" data-level="" data-path="index.html"><a href="index.html"><i class="fa fa-check"></i>Preface</a>
<ul>
<li class="chapter" data-level="0.1" data-path="index.html"><a href="index.html#what-is-statistics"><i class="fa fa-check"></i><b>0.1</b> What is statistics?</a></li>
<li class="chapter" data-level="0.2" data-path="index.html"><a href="index.html#why-this-module-is-important"><i class="fa fa-check"></i><b>0.2</b> Why this module is important</a></li>
<li class="chapter" data-level="0.3" data-path="index.html"><a href="index.html#teaching-overview"><i class="fa fa-check"></i><b>0.3</b> Teaching overview</a></li>
<li class="chapter" data-level="0.4" data-path="index.html"><a href="index.html#assessment-overview"><i class="fa fa-check"></i><b>0.4</b> Assessment overview</a>
<ul>
<li class="chapter" data-level="0.4.1" data-path="index.html"><a href="index.html#test-1f"><i class="fa fa-check"></i><b>0.4.1</b> Test 1F</a></li>
<li class="chapter" data-level="0.4.2" data-path="index.html"><a href="index.html#test-1s"><i class="fa fa-check"></i><b>0.4.2</b> Test 1S</a></li>
<li class="chapter" data-level="0.4.3" data-path="index.html"><a href="index.html#test-2s"><i class="fa fa-check"></i><b>0.4.3</b> Test 2S</a></li>
<li class="chapter" data-level="0.4.4" data-path="index.html"><a href="index.html#mock-exam"><i class="fa fa-check"></i><b>0.4.4</b> Mock Exam</a></li>
<li class="chapter" data-level="0.4.5" data-path="index.html"><a href="index.html#exam"><i class="fa fa-check"></i><b>0.4.5</b> Exam</a></li>
</ul></li>
<li class="chapter" data-level="0.5" data-path="index.html"><a href="index.html#intro_jamovi"><i class="fa fa-check"></i><b>0.5</b> Jamovi statistical software</a></li>
<li class="chapter" data-level="0.6" data-path="index.html"><a href="index.html#textbooks"><i class="fa fa-check"></i><b>0.6</b> Textbooks</a></li>
<li class="chapter" data-level="0.7" data-path="index.html"><a href="index.html#canvas"><i class="fa fa-check"></i><b>0.7</b> Canvas</a></li>
<li class="chapter" data-level="0.8" data-path="index.html"><a href="index.html#timetable"><i class="fa fa-check"></i><b>0.8</b> Timetable</a></li>
</ul></li>
<li class="part"><span><b>I Background mathematics and data organisation</b></span></li>
<li class="chapter" data-level="" data-path="week-1-overview.html"><a href="week-1-overview.html"><i class="fa fa-check"></i>Week 1 Overview</a></li>
<li class="chapter" data-level="1" data-path="background_mathematics.html"><a href="background_mathematics.html"><i class="fa fa-check"></i><b>1</b> Background mathematics</a>
<ul>
<li class="chapter" data-level="1.1" data-path="background_mathematics.html"><a href="background_mathematics.html#numbers-and-operations"><i class="fa fa-check"></i><b>1.1</b> Numbers and operations</a></li>
<li class="chapter" data-level="1.2" data-path="background_mathematics.html"><a href="background_mathematics.html#order-of-operations"><i class="fa fa-check"></i><b>1.2</b> Order of operations</a></li>
</ul></li>
<li class="chapter" data-level="2" data-path="data_organisation.html"><a href="data_organisation.html"><i class="fa fa-check"></i><b>2</b> Data organisation</a>
<ul>
<li class="chapter" data-level="2.1" data-path="data_organisation.html"><a href="data_organisation.html#tidy-data"><i class="fa fa-check"></i><b>2.1</b> Tidy data</a></li>
<li class="chapter" data-level="2.2" data-path="data_organisation.html"><a href="data_organisation.html#data-files"><i class="fa fa-check"></i><b>2.2</b> Data files</a></li>
</ul></li>
<li class="chapter" data-level="3" data-path="practical-preparing-real-datasets.html"><a href="practical-preparing-real-datasets.html"><i class="fa fa-check"></i><b>3</b> <em>Practical</em>: Preparing real datasets</a>
<ul>
<li class="chapter" data-level="3.1" data-path="practical-preparing-real-datasets.html"><a href="practical-preparing-real-datasets.html#libreoffice-calc"><i class="fa fa-check"></i><b>3.1</b> LibreOffice Calc</a></li>
<li class="chapter" data-level="3.2" data-path="practical-preparing-real-datasets.html"><a href="practical-preparing-real-datasets.html#exercise-organising-data-1"><i class="fa fa-check"></i><b>3.2</b> Exercise Organising data 1</a></li>
<li class="chapter" data-level="3.3" data-path="practical-preparing-real-datasets.html"><a href="practical-preparing-real-datasets.html#exercise-organising-data-2"><i class="fa fa-check"></i><b>3.3</b> Exercise Organising data 2</a></li>
<li class="chapter" data-level="3.4" data-path="practical-preparing-real-datasets.html"><a href="practical-preparing-real-datasets.html#exercise-organising-data-3"><i class="fa fa-check"></i><b>3.4</b> Exercise Organising data 3</a></li>
<li class="chapter" data-level="3.5" data-path="practical-preparing-real-datasets.html"><a href="practical-preparing-real-datasets.html#summary-of-exercises-and-why-they-are-useful."><i class="fa fa-check"></i><b>3.5</b> Summary of exercises and why they are useful.</a></li>
</ul></li>
<li class="part"><span><b>II Statistical concepts</b></span></li>
<li class="chapter" data-level="" data-path="week-2-overview.html"><a href="week-2-overview.html"><i class="fa fa-check"></i>Week 2 Overview</a></li>
<li class="chapter" data-level="4" data-path="Chapter_4.html"><a href="Chapter_4.html"><i class="fa fa-check"></i><b>4</b> Populations and samples</a></li>
<li class="chapter" data-level="5" data-path="Chapter_5.html"><a href="Chapter_5.html"><i class="fa fa-check"></i><b>5</b> Types of variables</a></li>
<li class="chapter" data-level="6" data-path="Chapter_6.html"><a href="Chapter_6.html"><i class="fa fa-check"></i><b>6</b> Accuracy, precision, and units</a>
<ul>
<li class="chapter" data-level="6.1" data-path="Chapter_6.html"><a href="Chapter_6.html#accuracy"><i class="fa fa-check"></i><b>6.1</b> Accuracy</a></li>
<li class="chapter" data-level="6.2" data-path="Chapter_6.html"><a href="Chapter_6.html#precision"><i class="fa fa-check"></i><b>6.2</b> Precision</a></li>
<li class="chapter" data-level="6.3" data-path="Chapter_6.html"><a href="Chapter_6.html#systems-of-units"><i class="fa fa-check"></i><b>6.3</b> Systems of units</a></li>
<li class="chapter" data-level="6.4" data-path="Chapter_6.html"><a href="Chapter_6.html#other-examples-of-units"><i class="fa fa-check"></i><b>6.4</b> Other examples of units</a>
<ul>
<li class="chapter" data-level="6.4.1" data-path="Chapter_6.html"><a href="Chapter_6.html#units-of-density"><i class="fa fa-check"></i><b>6.4.1</b> Units of density</a></li>
<li class="chapter" data-level="6.4.2" data-path="Chapter_6.html"><a href="Chapter_6.html#mass-of-metal-discharged-from-a-catchment"><i class="fa fa-check"></i><b>6.4.2</b> Mass of metal discharged from a catchment</a></li>
<li class="chapter" data-level="6.4.3" data-path="Chapter_6.html"><a href="Chapter_6.html#soil-carbon-inventories"><i class="fa fa-check"></i><b>6.4.3</b> Soil carbon inventories</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="7" data-path="Chapter_7.html"><a href="Chapter_7.html"><i class="fa fa-check"></i><b>7</b> Uncertainty propogation</a>
<ul>
<li class="chapter" data-level="7.1" data-path="Chapter_7.html"><a href="Chapter_7.html#adding-or-subtracting-errors"><i class="fa fa-check"></i><b>7.1</b> Adding or subtracting errors</a></li>
<li class="chapter" data-level="7.2" data-path="Chapter_7.html"><a href="Chapter_7.html#multiplying-or-dividing-errors"><i class="fa fa-check"></i><b>7.2</b> Multiplying or dividing errors</a></li>
<li class="chapter" data-level="7.3" data-path="Chapter_7.html"><a href="Chapter_7.html#applying-formulas-for-combining-errors"><i class="fa fa-check"></i><b>7.3</b> Applying formulas for combining errors</a></li>
</ul></li>
<li class="chapter" data-level="8" data-path="Chapter_8.html"><a href="Chapter_8.html"><i class="fa fa-check"></i><b>8</b> <em>Practical</em>. Introduction to Jamovi</a>
<ul>
<li class="chapter" data-level="8.1" data-path="Chapter_8.html"><a href="Chapter_8.html#summary_statistics_02"><i class="fa fa-check"></i><b>8.1</b> Exercise for summary statistics</a></li>
<li class="chapter" data-level="8.2" data-path="Chapter_8.html"><a href="Chapter_8.html#transforming_variables_02"><i class="fa fa-check"></i><b>8.2</b> Exercise on transforming variables</a></li>
<li class="chapter" data-level="8.3" data-path="Chapter_8.html"><a href="Chapter_8.html#computing_variables_02"><i class="fa fa-check"></i><b>8.3</b> Exercise on computing variables</a></li>
</ul></li>
<li class="part"><span><b>III Summary statistics</b></span></li>
<li class="chapter" data-level="" data-path="week-3-overview.html"><a href="week-3-overview.html"><i class="fa fa-check"></i>Week 3 Overview</a></li>
<li class="chapter" data-level="9" data-path="Chapter_9.html"><a href="Chapter_9.html"><i class="fa fa-check"></i><b>9</b> Decimal places, significant figures, and rounding</a>
<ul>
<li class="chapter" data-level="9.1" data-path="Chapter_9.html"><a href="Chapter_9.html#decimal-places-and-significant-figures"><i class="fa fa-check"></i><b>9.1</b> Decimal places and significant figures</a></li>
<li class="chapter" data-level="9.2" data-path="Chapter_9.html"><a href="Chapter_9.html#rounding"><i class="fa fa-check"></i><b>9.2</b> Rounding</a></li>
</ul></li>
<li class="chapter" data-level="10" data-path="Chapter_10.html"><a href="Chapter_10.html"><i class="fa fa-check"></i><b>10</b> Graphs</a>
<ul>
<li class="chapter" data-level="10.1" data-path="Chapter_10.html"><a href="Chapter_10.html#histograms"><i class="fa fa-check"></i><b>10.1</b> Histograms</a></li>
<li class="chapter" data-level="10.2" data-path="Chapter_10.html"><a href="Chapter_10.html#barplots-and-pie-charts"><i class="fa fa-check"></i><b>10.2</b> Barplots and pie charts</a></li>
<li class="chapter" data-level="10.3" data-path="Chapter_10.html"><a href="Chapter_10.html#box-whisker-plots"><i class="fa fa-check"></i><b>10.3</b> Box-whisker plots</a></li>
</ul></li>
<li class="chapter" data-level="11" data-path="Chapter_11.html"><a href="Chapter_11.html"><i class="fa fa-check"></i><b>11</b> Measures of central tendency</a>
<ul>
<li class="chapter" data-level="11.1" data-path="Chapter_11.html"><a href="Chapter_11.html#the-mean"><i class="fa fa-check"></i><b>11.1</b> The mean</a></li>
<li class="chapter" data-level="11.2" data-path="Chapter_11.html"><a href="Chapter_11.html#the-mode"><i class="fa fa-check"></i><b>11.2</b> The mode</a></li>
<li class="chapter" data-level="11.3" data-path="Chapter_11.html"><a href="Chapter_11.html#the-median-and-quantiles"><i class="fa fa-check"></i><b>11.3</b> The median and quantiles</a></li>
</ul></li>
<li class="chapter" data-level="12" data-path="Chapter_12.html"><a href="Chapter_12.html"><i class="fa fa-check"></i><b>12</b> Measures of spread</a>
<ul>
<li class="chapter" data-level="12.1" data-path="Chapter_12.html"><a href="Chapter_12.html#the-range"><i class="fa fa-check"></i><b>12.1</b> The range</a></li>
<li class="chapter" data-level="12.2" data-path="Chapter_12.html"><a href="Chapter_12.html#the-inter-quartile-range"><i class="fa fa-check"></i><b>12.2</b> The inter-quartile range</a></li>
<li class="chapter" data-level="12.3" data-path="Chapter_12.html"><a href="Chapter_12.html#the-variance"><i class="fa fa-check"></i><b>12.3</b> The variance</a></li>
<li class="chapter" data-level="12.4" data-path="Chapter_12.html"><a href="Chapter_12.html#the-standard-deviation"><i class="fa fa-check"></i><b>12.4</b> The standard deviation</a></li>
<li class="chapter" data-level="12.5" data-path="Chapter_12.html"><a href="Chapter_12.html#the-coefficient-of-variation"><i class="fa fa-check"></i><b>12.5</b> The coefficient of variation</a></li>
<li class="chapter" data-level="12.6" data-path="Chapter_12.html"><a href="Chapter_12.html#the-standard-error"><i class="fa fa-check"></i><b>12.6</b> The standard error</a></li>
</ul></li>
<li class="chapter" data-level="13" data-path="Chapter_13.html"><a href="Chapter_13.html"><i class="fa fa-check"></i><b>13</b> <em>Practical</em>. Plotting and statistical summaries in Jamovi</a>
<ul>
<li class="chapter" data-level="13.1" data-path="Chapter_13.html"><a href="Chapter_13.html#reorganise-the-dataset-into-a-tidy-format"><i class="fa fa-check"></i><b>13.1</b> Reorganise the dataset into a tidy format</a></li>
<li class="chapter" data-level="13.2" data-path="Chapter_13.html"><a href="Chapter_13.html#histograms-and-box-whisker-plots"><i class="fa fa-check"></i><b>13.2</b> Histograms and box-whisker plots</a></li>
<li class="chapter" data-level="13.3" data-path="Chapter_13.html"><a href="Chapter_13.html#calculate-summary-statistics"><i class="fa fa-check"></i><b>13.3</b> Calculate summary statistics</a></li>
<li class="chapter" data-level="13.4" data-path="Chapter_13.html"><a href="Chapter_13.html#reporting-decimals-and-significant-figures"><i class="fa fa-check"></i><b>13.4</b> Reporting decimals and significant figures</a></li>
<li class="chapter" data-level="13.5" data-path="Chapter_13.html"><a href="Chapter_13.html#comparing-across-sites"><i class="fa fa-check"></i><b>13.5</b> Comparing across sites</a></li>
</ul></li>
<li class="part"><span><b>IV Probability models and the Central Limit Theorem</b></span></li>
<li class="chapter" data-level="" data-path="week-4-overview.html"><a href="week-4-overview.html"><i class="fa fa-check"></i>Week 4 Overview</a></li>
<li class="chapter" data-level="14" data-path="introduction-to-probability-models.html"><a href="introduction-to-probability-models.html"><i class="fa fa-check"></i><b>14</b> Introduction to probability models</a>
<ul>
<li class="chapter" data-level="14.1" data-path="introduction-to-probability-models.html"><a href="introduction-to-probability-models.html#a-practical-example"><i class="fa fa-check"></i><b>14.1</b> A practical example</a></li>
<li class="chapter" data-level="14.2" data-path="introduction-to-probability-models.html"><a href="introduction-to-probability-models.html#probability-distributions"><i class="fa fa-check"></i><b>14.2</b> Probability distributions</a>
<ul>
<li class="chapter" data-level="14.2.1" data-path="introduction-to-probability-models.html"><a href="introduction-to-probability-models.html#binomial-distribution"><i class="fa fa-check"></i><b>14.2.1</b> Binomial distribution</a></li>
<li class="chapter" data-level="14.2.2" data-path="introduction-to-probability-models.html"><a href="introduction-to-probability-models.html#poisson-distribution"><i class="fa fa-check"></i><b>14.2.2</b> Poisson distribution</a></li>
<li class="chapter" data-level="14.2.3" data-path="introduction-to-probability-models.html"><a href="introduction-to-probability-models.html#normal-distribution"><i class="fa fa-check"></i><b>14.2.3</b> Normal distribution</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="15" data-path="the-central-limit-theorem-clt.html"><a href="the-central-limit-theorem-clt.html"><i class="fa fa-check"></i><b>15</b> The Central Limit Theorem (CLT)</a>
<ul>
<li class="chapter" data-level="15.1" data-path="the-central-limit-theorem-clt.html"><a href="the-central-limit-theorem-clt.html#examples-of-the-clt-in-action"><i class="fa fa-check"></i><b>15.1</b> Examples of the CLT in action</a></li>
<li class="chapter" data-level="15.2" data-path="the-central-limit-theorem-clt.html"><a href="the-central-limit-theorem-clt.html#the-standard-normal-distribution"><i class="fa fa-check"></i><b>15.2</b> The standard normal distribution</a></li>
<li class="chapter" data-level="15.3" data-path="the-central-limit-theorem-clt.html"><a href="the-central-limit-theorem-clt.html#what-are-z-scores"><i class="fa fa-check"></i><b>15.3</b> What are z-scores?</a></li>
</ul></li>
<li class="chapter" data-level="16" data-path="practical.-probability-and-simulation.html"><a href="practical.-probability-and-simulation.html"><i class="fa fa-check"></i><b>16</b> <em>Practical</em>. Probability and simulation</a>
<ul>
<li class="chapter" data-level="16.1" data-path="practical.-probability-and-simulation.html"><a href="practical.-probability-and-simulation.html#probabilities-from-a-dataset"><i class="fa fa-check"></i><b>16.1</b> Probabilities from a dataset</a></li>
<li class="chapter" data-level="16.2" data-path="practical.-probability-and-simulation.html"><a href="practical.-probability-and-simulation.html#probabilities-from-a-normal-distribution"><i class="fa fa-check"></i><b>16.2</b> Probabilities from a normal distribution</a></li>
<li class="chapter" data-level="16.3" data-path="practical.-probability-and-simulation.html"><a href="practical.-probability-and-simulation.html#central-limit-theorem"><i class="fa fa-check"></i><b>16.3</b> Central limit theorem</a></li>
</ul></li>
<li class="part"><span><b>V Statistical inference</b></span></li>
<li class="chapter" data-level="" data-path="week-5-overview.html"><a href="week-5-overview.html"><i class="fa fa-check"></i>Week 5 Overview</a></li>
<li class="chapter" data-level="17" data-path="sample-statistics-and-population-parameters.html"><a href="sample-statistics-and-population-parameters.html"><i class="fa fa-check"></i><b>17</b> Sample statistics and population parameters</a></li>
<li class="chapter" data-level="18" data-path="standard-normal-distribution.html"><a href="standard-normal-distribution.html"><i class="fa fa-check"></i><b>18</b> Standard Normal Distribution</a></li>
<li class="chapter" data-level="19" data-path="confidence-intervals.html"><a href="confidence-intervals.html"><i class="fa fa-check"></i><b>19</b> Confidence intervals</a></li>
<li class="chapter" data-level="20" data-path="the-t-interval.html"><a href="the-t-interval.html"><i class="fa fa-check"></i><b>20</b> The t-interval</a></li>
<li class="chapter" data-level="21" data-path="practical.-z--and-t--intervals.html"><a href="practical.-z--and-t--intervals.html"><i class="fa fa-check"></i><b>21</b> <em>Practical</em>. z- and t- intervals</a>
<ul>
<li class="chapter" data-level="21.1" data-path="practical.-z--and-t--intervals.html"><a href="practical.-z--and-t--intervals.html#example-constructing-confidence-intervals"><i class="fa fa-check"></i><b>21.1</b> Example constructing confidence intervals</a></li>
<li class="chapter" data-level="21.2" data-path="practical.-z--and-t--intervals.html"><a href="practical.-z--and-t--intervals.html#confidence-interval-for-different-levels-t--and-z-"><i class="fa fa-check"></i><b>21.2</b> Confidence interval for different levels (t- and z-)</a></li>
<li class="chapter" data-level="21.3" data-path="practical.-z--and-t--intervals.html"><a href="practical.-z--and-t--intervals.html#proportion-confidence-intervals"><i class="fa fa-check"></i><b>21.3</b> Proportion confidence intervals</a></li>
<li class="chapter" data-level="21.4" data-path="practical.-z--and-t--intervals.html"><a href="practical.-z--and-t--intervals.html#another-confidence-interval-example"><i class="fa fa-check"></i><b>21.4</b> Another confidence interval example?</a></li>
</ul></li>
<li class="part"><span><b>VI Review of parts I-V</b></span></li>
<li class="chapter" data-level="" data-path="week-6-overview-reading-week.html"><a href="week-6-overview-reading-week.html"><i class="fa fa-check"></i>Week 6 Overview (Reading week)</a></li>
<li class="part"><span><b>VII Hypothesis testing</b></span></li>
<li class="chapter" data-level="" data-path="week-7-overview.html"><a href="week-7-overview.html"><i class="fa fa-check"></i>Week 7 Overview</a></li>
<li class="chapter" data-level="22" data-path="what-is-hypothesis-testing.html"><a href="what-is-hypothesis-testing.html"><i class="fa fa-check"></i><b>22</b> What is hypothesis testing?</a></li>
<li class="chapter" data-level="23" data-path="making-and-using-hypotheses-and-types-of-tests.html"><a href="making-and-using-hypotheses-and-types-of-tests.html"><i class="fa fa-check"></i><b>23</b> Making and using hypotheses and types of tests</a></li>
<li class="chapter" data-level="24" data-path="an-example-of-hypothesis-testing.html"><a href="an-example-of-hypothesis-testing.html"><i class="fa fa-check"></i><b>24</b> An example of hypothesis testing</a></li>
<li class="chapter" data-level="25" data-path="hypothesis-testing-and-confidence-intervals.html"><a href="hypothesis-testing-and-confidence-intervals.html"><i class="fa fa-check"></i><b>25</b> Hypothesis testing and confidence intervals</a></li>
<li class="chapter" data-level="26" data-path="student-t-distribution-and-one-sample-t-test.html"><a href="student-t-distribution-and-one-sample-t-test.html"><i class="fa fa-check"></i><b>26</b> Student t-distribution and one sample t-test</a></li>
<li class="chapter" data-level="27" data-path="another-example-of-a-one-sample-t-test.html"><a href="another-example-of-a-one-sample-t-test.html"><i class="fa fa-check"></i><b>27</b> Another example of a one sample t-test</a></li>
<li class="chapter" data-level="28" data-path="independent-t-test.html"><a href="independent-t-test.html"><i class="fa fa-check"></i><b>28</b> Independent t-test</a></li>
<li class="chapter" data-level="29" data-path="paired-sample-t-test.html"><a href="paired-sample-t-test.html"><i class="fa fa-check"></i><b>29</b> Paired sample t-test</a></li>
<li class="chapter" data-level="30" data-path="violations-of-assumptions.html"><a href="violations-of-assumptions.html"><i class="fa fa-check"></i><b>30</b> Violations of assumptions</a></li>
<li class="chapter" data-level="31" data-path="non-parametric-tests-and-what-these-are..html"><a href="non-parametric-tests-and-what-these-are..html"><i class="fa fa-check"></i><b>31</b> Non-parametric tests, and what these are.</a></li>
<li class="chapter" data-level="32" data-path="practical.-hypothesis-testing-and-t-tests.html"><a href="practical.-hypothesis-testing-and-t-tests.html"><i class="fa fa-check"></i><b>32</b> <em>Practical</em>. Hypothesis testing and t-tests</a>
<ul>
<li class="chapter" data-level="32.1" data-path="practical.-hypothesis-testing-and-t-tests.html"><a href="practical.-hypothesis-testing-and-t-tests.html#exercise-on-a-simple-one-sample-t-test"><i class="fa fa-check"></i><b>32.1</b> Exercise on a simple one sample t-test</a></li>
<li class="chapter" data-level="32.2" data-path="practical.-hypothesis-testing-and-t-tests.html"><a href="practical.-hypothesis-testing-and-t-tests.html#exercise-on-an-independent-sample-t-test"><i class="fa fa-check"></i><b>32.2</b> Exercise on an independent sample t-test</a></li>
<li class="chapter" data-level="32.3" data-path="practical.-hypothesis-testing-and-t-tests.html"><a href="practical.-hypothesis-testing-and-t-tests.html#exercise-involving-multiple-comparisons"><i class="fa fa-check"></i><b>32.3</b> Exercise involving multiple comparisons</a></li>
<li class="chapter" data-level="32.4" data-path="practical.-hypothesis-testing-and-t-tests.html"><a href="practical.-hypothesis-testing-and-t-tests.html#exercise-with-non-parametric"><i class="fa fa-check"></i><b>32.4</b> Exercise with non-parametric</a></li>
<li class="chapter" data-level="32.5" data-path="practical.-hypothesis-testing-and-t-tests.html"><a href="practical.-hypothesis-testing-and-t-tests.html#another-exercise-with-non-parametric"><i class="fa fa-check"></i><b>32.5</b> Another exercise with non-parametric</a></li>
</ul></li>
<li class="part"><span><b>VIII Analysis of Variance (ANOVA)</b></span></li>
<li class="chapter" data-level="" data-path="week-8-overview.html"><a href="week-8-overview.html"><i class="fa fa-check"></i>Week 8 Overview</a></li>
<li class="chapter" data-level="33" data-path="what-is-anova.html"><a href="what-is-anova.html"><i class="fa fa-check"></i><b>33</b> What is ANOVA?</a></li>
<li class="chapter" data-level="34" data-path="one-way-anova.html"><a href="one-way-anova.html"><i class="fa fa-check"></i><b>34</b> One-way ANOVA</a></li>
<li class="chapter" data-level="35" data-path="two-way-anova.html"><a href="two-way-anova.html"><i class="fa fa-check"></i><b>35</b> Two-way ANOVA</a></li>
<li class="chapter" data-level="36" data-path="kruskall-wallis-h-test.html"><a href="kruskall-wallis-h-test.html"><i class="fa fa-check"></i><b>36</b> Kruskall-Wallis H test</a></li>
<li class="chapter" data-level="37" data-path="practical.-anova-and-associated-tests.html"><a href="practical.-anova-and-associated-tests.html"><i class="fa fa-check"></i><b>37</b> <em>Practical</em>. ANOVA and associated tests</a>
<ul>
<li class="chapter" data-level="37.1" data-path="practical.-anova-and-associated-tests.html"><a href="practical.-anova-and-associated-tests.html#anova-exercise-1"><i class="fa fa-check"></i><b>37.1</b> ANOVA Exercise 1</a></li>
<li class="chapter" data-level="37.2" data-path="practical.-anova-and-associated-tests.html"><a href="practical.-anova-and-associated-tests.html#anova-exercise-2"><i class="fa fa-check"></i><b>37.2</b> ANOVA Exercise 2</a></li>
<li class="chapter" data-level="37.3" data-path="practical.-anova-and-associated-tests.html"><a href="practical.-anova-and-associated-tests.html#anova-exercise-3"><i class="fa fa-check"></i><b>37.3</b> ANOVA Exercise 3</a></li>
<li class="chapter" data-level="37.4" data-path="practical.-anova-and-associated-tests.html"><a href="practical.-anova-and-associated-tests.html#anova-exercise-4"><i class="fa fa-check"></i><b>37.4</b> ANOVA Exercise 4</a></li>
</ul></li>
<li class="part"><span><b>IX Counts and Correlation</b></span></li>
<li class="chapter" data-level="" data-path="week-9-overview.html"><a href="week-9-overview.html"><i class="fa fa-check"></i>Week 9 Overview</a></li>
<li class="chapter" data-level="38" data-path="frequency-and-count-data.html"><a href="frequency-and-count-data.html"><i class="fa fa-check"></i><b>38</b> Frequency and count data</a></li>
<li class="chapter" data-level="39" data-path="chi-squared-goodness-of-fit.html"><a href="chi-squared-goodness-of-fit.html"><i class="fa fa-check"></i><b>39</b> Chi-squared goodness of fit</a></li>
<li class="chapter" data-level="40" data-path="chi-squared-test-of-association.html"><a href="chi-squared-test-of-association.html"><i class="fa fa-check"></i><b>40</b> Chi-squared test of association</a></li>
<li class="chapter" data-level="41" data-path="correlation-key-concepts.html"><a href="correlation-key-concepts.html"><i class="fa fa-check"></i><b>41</b> Correlation key concepts</a></li>
<li class="chapter" data-level="42" data-path="correlation-mathematics.html"><a href="correlation-mathematics.html"><i class="fa fa-check"></i><b>42</b> Correlation mathematics</a></li>
<li class="chapter" data-level="43" data-path="correlation-hypothesis-testing.html"><a href="correlation-hypothesis-testing.html"><i class="fa fa-check"></i><b>43</b> Correlation hypothesis testing</a></li>
<li class="chapter" data-level="44" data-path="practical.-analysis-of-count-data-correlation-and-regression.html"><a href="practical.-analysis-of-count-data-correlation-and-regression.html"><i class="fa fa-check"></i><b>44</b> <em>Practical</em>. Analysis of count data, correlation, and regression</a>
<ul>
<li class="chapter" data-level="44.1" data-path="practical.-analysis-of-count-data-correlation-and-regression.html"><a href="practical.-analysis-of-count-data-correlation-and-regression.html#chi-square-exercise-1"><i class="fa fa-check"></i><b>44.1</b> Chi-Square Exercise 1</a></li>
<li class="chapter" data-level="44.2" data-path="practical.-analysis-of-count-data-correlation-and-regression.html"><a href="practical.-analysis-of-count-data-correlation-and-regression.html#chi-square-association-exercise-2"><i class="fa fa-check"></i><b>44.2</b> Chi-Square association Exercise 2</a></li>
<li class="chapter" data-level="44.3" data-path="practical.-analysis-of-count-data-correlation-and-regression.html"><a href="practical.-analysis-of-count-data-correlation-and-regression.html#correlation-exercise-3"><i class="fa fa-check"></i><b>44.3</b> Correlation Exercise 3</a></li>
<li class="chapter" data-level="44.4" data-path="practical.-analysis-of-count-data-correlation-and-regression.html"><a href="practical.-analysis-of-count-data-correlation-and-regression.html#correlation-exercise-4"><i class="fa fa-check"></i><b>44.4</b> Correlation Exercise 4</a></li>
</ul></li>
<li class="part"><span><b>X Linear Regression</b></span></li>
<li class="chapter" data-level="" data-path="week-10-overview.html"><a href="week-10-overview.html"><i class="fa fa-check"></i>Week 10 Overview</a></li>
<li class="chapter" data-level="45" data-path="regression-key-concepts.html"><a href="regression-key-concepts.html"><i class="fa fa-check"></i><b>45</b> Regression key concepts</a></li>
<li class="chapter" data-level="46" data-path="regression-validity.html"><a href="regression-validity.html"><i class="fa fa-check"></i><b>46</b> Regression validity</a></li>
<li class="chapter" data-level="47" data-path="introduction-to-multiple-regression.html"><a href="introduction-to-multiple-regression.html"><i class="fa fa-check"></i><b>47</b> Introduction to multiple regression</a></li>
<li class="chapter" data-level="48" data-path="model-selection-maybe-remove-this.html"><a href="model-selection-maybe-remove-this.html"><i class="fa fa-check"></i><b>48</b> Model selection (maybe remove this?)</a></li>
<li class="chapter" data-level="49" data-path="practical.-using-regression.html"><a href="practical.-using-regression.html"><i class="fa fa-check"></i><b>49</b> <em>Practical</em>. Using regression</a>
<ul>
<li class="chapter" data-level="49.1" data-path="practical.-using-regression.html"><a href="practical.-using-regression.html#regression-exercise-1"><i class="fa fa-check"></i><b>49.1</b> Regression Exercise 1</a></li>
<li class="chapter" data-level="49.2" data-path="practical.-using-regression.html"><a href="practical.-using-regression.html#regression-exercise-2"><i class="fa fa-check"></i><b>49.2</b> Regression Exercise 2</a></li>
<li class="chapter" data-level="49.3" data-path="practical.-using-regression.html"><a href="practical.-using-regression.html#regression-exercise-3"><i class="fa fa-check"></i><b>49.3</b> Regression Exercise 3</a></li>
<li class="chapter" data-level="49.4" data-path="practical.-using-regression.html"><a href="practical.-using-regression.html#regression-exercise-4"><i class="fa fa-check"></i><b>49.4</b> Regression Exercise 4</a></li>
</ul></li>
<li class="part"><span><b>XI Randomisation approaches</b></span></li>
<li class="chapter" data-level="" data-path="week-11-overview.html"><a href="week-11-overview.html"><i class="fa fa-check"></i>Week 11 Overview</a></li>
<li class="chapter" data-level="50" data-path="introduction-to-randomisation.html"><a href="introduction-to-randomisation.html"><i class="fa fa-check"></i><b>50</b> Introduction to randomisation</a></li>
<li class="chapter" data-level="51" data-path="assumptions-of-randomisation.html"><a href="assumptions-of-randomisation.html"><i class="fa fa-check"></i><b>51</b> Assumptions of randomisation</a></li>
<li class="chapter" data-level="52" data-path="bootstrapping.html"><a href="bootstrapping.html"><i class="fa fa-check"></i><b>52</b> Bootstrapping</a></li>
<li class="chapter" data-level="53" data-path="monte-carlo.html"><a href="monte-carlo.html"><i class="fa fa-check"></i><b>53</b> Monte Carlo</a></li>
<li class="chapter" data-level="54" data-path="practical.-using-r.html"><a href="practical.-using-r.html"><i class="fa fa-check"></i><b>54</b> <em>Practical</em>. Using R</a>
<ul>
<li class="chapter" data-level="54.1" data-path="practical.-using-r.html"><a href="practical.-using-r.html#r-exercise-1"><i class="fa fa-check"></i><b>54.1</b> R Exercise 1</a></li>
<li class="chapter" data-level="54.2" data-path="practical.-using-r.html"><a href="practical.-using-r.html#r-exercise-2"><i class="fa fa-check"></i><b>54.2</b> R Exercise 2</a></li>
<li class="chapter" data-level="54.3" data-path="practical.-using-r.html"><a href="practical.-using-r.html#r-exercise-3"><i class="fa fa-check"></i><b>54.3</b> R Exercise 3</a></li>
</ul></li>
<li class="part"><span><b>XII Statistical Reporting</b></span></li>
<li class="chapter" data-level="" data-path="week-12-overview.html"><a href="week-12-overview.html"><i class="fa fa-check"></i>Week 12 Overview</a></li>
<li class="chapter" data-level="55" data-path="reporting-statistics.html"><a href="reporting-statistics.html"><i class="fa fa-check"></i><b>55</b> Reporting statistics</a></li>
<li class="chapter" data-level="56" data-path="more-introduction-to-r.html"><a href="more-introduction-to-r.html"><i class="fa fa-check"></i><b>56</b> More introduction to R</a></li>
<li class="chapter" data-level="57" data-path="more-getting-started-with-r.html"><a href="more-getting-started-with-r.html"><i class="fa fa-check"></i><b>57</b> More getting started with R</a></li>
<li class="chapter" data-level="58" data-path="practical.-using-r-1.html"><a href="practical.-using-r-1.html"><i class="fa fa-check"></i><b>58</b> <em>Practical</em>. Using R</a>
<ul>
<li class="chapter" data-level="58.1" data-path="practical.-using-r-1.html"><a href="practical.-using-r-1.html#r-exercise-1-1"><i class="fa fa-check"></i><b>58.1</b> R Exercise 1</a></li>
<li class="chapter" data-level="58.2" data-path="practical.-using-r-1.html"><a href="practical.-using-r-1.html#r-exercise-2-1"><i class="fa fa-check"></i><b>58.2</b> R Exercise 2</a></li>
<li class="chapter" data-level="58.3" data-path="practical.-using-r-1.html"><a href="practical.-using-r-1.html#r-exercise-3-1"><i class="fa fa-check"></i><b>58.3</b> R Exercise 3</a></li>
</ul></li>
<li class="part"><span><b>XIII Review of parts (VII-XII)</b></span></li>
<li class="chapter" data-level="" data-path="module-summary.html"><a href="module-summary.html"><i class="fa fa-check"></i>Module summary</a></li>
<li class="appendix"><span><b>Appendix</b></span></li>
<li class="chapter" data-level="A" data-path="appendixA_units.html"><a href="appendixA_units.html"><i class="fa fa-check"></i><b>A</b> Statistical units</a></li>
<li class="chapter" data-level="B" data-path="uncertainty_derivation.html"><a href="uncertainty_derivation.html"><i class="fa fa-check"></i><b>B</b> Uncertainty derivation</a></li>
<li class="chapter" data-level="C" data-path="appendixC_tables.html"><a href="appendixC_tables.html"><i class="fa fa-check"></i><b>C</b> Statistical tables</a></li>
<li class="chapter" data-level="" data-path="references.html"><a href="references.html"><i class="fa fa-check"></i>References</a></li>
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<li><a href="https://github.com/rstudio/bookdown" target="blank">Published with bookdown</a></li>
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<h1><span class="header-section-number">Chapter 2</span> Data organisation<a href="data_organisation.html#data_organisation" class="anchor-section" aria-label="Anchor link to header"></a></h1>
<p>It is important to organise data properly so that statistical analysis can be done. Here I explain the tidy approach to data. Suggested reading Hadley Wickam’s paper.</p>
<div id="tidy-data" class="section level2 hasAnchor" number="2.1">
<h2><span class="header-section-number">2.1</span> Tidy data<a href="data_organisation.html#tidy-data" class="anchor-section" aria-label="Anchor link to header"></a></h2>
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<div id="data-files" class="section level2 hasAnchor" number="2.2">
<h2><span class="header-section-number">2.2</span> Data files<a href="data_organisation.html#data-files" class="anchor-section" aria-label="Anchor link to header"></a></h2>
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