offset role

[jdonland]

There's a new package on CRAN called offsetreg, which extends tidymodels with some additional model types and engines that use an offset, i.e., a variable which should always have a coefficient of 1 in the model. Maybe recipes could implement "offset" as a special role and automagically pass them to model engines that want them?

[EmilHvitfeldt]

Hello @jdonland 👋 Thank for your interest and request!

I would be hesitant to create a new special type of role. I made this decision based on a maintenance / benefit ratio.

For this to be implemented, we need to make "offset" a special role in {recipes}. This part isn't actually that hard. But it wouldn't do anything by itself. So we would also need to do a lot of changes in {workflows} (case weights was one such example tidymodels/workflows#118) which are non-trivial, and {parsnip} would need a change too, to be able to denote which model types want offsets and which doesn't. This is the minimum change needed for this to work. But i assume that some changes other places such as in {tune} would be needed as well.

This to me feels like too much additional code we have to maintain for the benefit it gives.

also, in case you haven't seen, I think you would find this interesting: tidymodels/tidymodels.org#59

[EmilHvitfeldt]

if you have any further questions or issues, please feel free to file an issue!

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