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<h1 class="title toc-ignore">Visualizations and the grammar of graphics</h1>
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<div id="cm002---march-28-2018" class="section level1">
<h1>cm002 - March 28, 2018</h1>
<div id="overview" class="section level2">
<h2>Overview</h2>
<ul>
<li>Identify the importance of graphics in communicating information</li>
<li>Define the layered grammar of graphics</li>
<li>Demonstrate how to use layered grammar of graphics to build Minard’s graph of Napoleon’s invasion of Russia</li>
<li>Practice generating layered graphics using <a href="https://github.com/hadley/ggplot2"><code>ggplot2</code></a></li>
</ul>
</div>
<div id="before-class" class="section level2">
<h2>Before class</h2>
<ul>
<li>Read chapters 1-4 from <a href="http://r4ds.had.co.nz/">R for Data Science</a>
<ul>
<li>Chapters 1, 2, and 4 are very short but set the stage for the next few weeks</li>
<li>Chapter 3 is crucial - you need to read this chapter and complete some of the exercises before coming to class. Exercise solutions can be found <a href="https://jrnold.github.io/r4ds-exercise-solutions/">here</a>.</li>
</ul></li>
<li>Read <a href="dataviz_grammar_of_graphics.html">The grammar of graphics</a>
<ul>
<li>If you have additional time, also read/skim <a href="http://www-tandfonline-com.proxy.uchicago.edu/doi/abs/10.1198/jcgs.2009.07098">A Layered Grammar of Graphics</a></li>
</ul></li>
<li><a href="setup00.html">Install and setup software</a>
<ul>
<li>Definitely have R and RStudio installed and operational for class today</li>
<li>If you haven’t gotten GitHub setup yet, that’s fine but you will need it to complete <a href="hw01-edit-README.html">homework 1</a></li>
</ul></li>
</ul>
</div>
<div id="slides-and-class-materials" class="section level2">
<h2>Slides and class materials</h2>
<ul>
<li><a href="extras/cm002_slides.html">Slides</a></li>
<li><a href="dataviz_why.html">Why visualize data?</a></li>
<li><a href="dataviz_minard.html">How to build a complicated, layered graphic</a></li>
<li><p><a href="dataviz_gapminder.html">Practice generating layered graphics using <code>ggplot2</code></a></p></li>
<li><p><a href="https://github.com/andrewheiss/fancy-minard">Exploring Minard’s 1812 plot with <code>ggplot2</code></a> - a much fancier (and more complex) version</p></li>
</ul>
</div>
<div id="additional-resources" class="section level2">
<h2>Additional resources</h2>
<div id="graphical-design" class="section level3">
<h3>Graphical design</h3>
<ul>
<li><a href="https://www.edwardtufte.com/tufte/books_vdqi">Tufte, Edward R. <em>The Visual Display of Quantitative Information</em>.</a> Classic book on statistical graphics and visualization design.</li>
</ul>
</div>
<div id="ggplot2" class="section level3">
<h3><code>ggplot2</code></h3>
<ul>
<li><a href="http://link.springer.com.proxy.uchicago.edu/book/10.1007/978-3-319-24277-4">ggplot2: Elegant Graphics for Data Analysis, 2nd Edition</a> – Hadley Wickham. Excellent resource for learning the intricacies of <code>ggplot2</code>.</li>
<li><a href="http://docs.ggplot2.org/current/">Documentation for ggplot2</a></li>
<li>Why do we learn the <code>ggplot2</code> graphics library and not the base <a href="https://cran.r-project.org/web/views/Graphics.html"><code>graphics</code></a> system? David Robinson explains it well in <a href="http://varianceexplained.org/r/teach_ggplot2_to_beginners/">Don’t teach built-in plotting to beginners (teach ggplot2)</a>, and follows up with a longer defense of <code>ggplot2</code> in <a href="http://varianceexplained.org/r/why-I-use-ggplot2/">Why I use ggplot2</a></li>
</ul>
</div>
<div id="useful-cheatsheets" class="section level3">
<h3>Useful cheatsheets</h3>
<ul>
<li><a href="https://www.rstudio.com/wp-content/uploads/2015/03/ggplot2-cheatsheet.pdf">Data visualization with ggplot2 cheat sheet</a></li>
<li><a href="https://www.rstudio.com/wp-content/uploads/2016/01/rstudio-IDE-cheatsheet.pdf">RStudio IDE Cheat Sheet</a> - if you don’t know what all the buttons and panels do in RStudio, this is a great decoder</li>
</ul>
</div>
</div>
<div id="what-you-need-to-do" class="section level2">
<h2>What you need to do</h2>
<ul>
<li><a href="https://goo.gl/forms/AI8bJOZv0niNzhPA2">Register your GitHub username for the course</a> - all remaining homework assignments will be in <strong>private repositories</strong>. Private repos can only be seen and edited by members of our <a href="https://github.com/uc-cfss">course organization</a>. Once you register your GitHub account, I will invite you to join the course organization. If you don’t register your account, you won’t have access to any of the homework assignments.</li>
<li><a href="hw01-edit-README.html">Complete homework 1</a></li>
<li>Install the <a href="https://github.com/uc-cfss/rcfss"><code>rcfss</code></a> library from GitHub. To install the package, run the command <code>devtools::install_github("uc-cfss/rcfss")</code> in the console. We will be using data from this package in class next week.</li>
</ul>
<blockquote>
<p>If you do not already have the <code>devtools</code> library installed, you will get an error. Go back and install this first using <code>install.packages("devtools")</code>, then run <code>devtools::install_github("uc-cfss/rcfss")</code> in the console.</p>
</blockquote>
</div>
</div>
<p>This work is licensed under the <a href="http://creativecommons.org/licenses/by-nc/4.0/">CC BY-NC 4.0 Creative Commons License</a>.</p>
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