More functionality for residual plots

[milkha]

1 - It would be useful to have grouped residuals. For instance, ppc_resid_hist_group. This can tell us about the distribution of residuals at a finer level which can provide some insight into the fit of the model.

2 - Currently, there is no way to change the x-axis in residual plots. For discrete variables on the x-axis, we might want to have a box-plot for the residuals for each point.

[jgabry]

Thanks for following up and opening the issues!

On Thursday, October 13, 2016, milkha notifications@github.com wrote:

1 - It would be useful to have grouped residuals. For instance,
ppc_resid_hist_group. This can tell us about the distribution of residuals
at a finer level which can provide some insight into the fit of the model.

2 - Currently, there is no way to change the x-axis in residual plots. For
discrete variables on the x-axis, we might want to have a box-plot for the
residuals for each point.

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[jgabry]

• predictive errors by group
• predictive errors vs x variable (e.g. predictor or time)

[jgabry]

@milkha @rtrangucci fyi, i changed "residual" to "predictive error", which is more technically correct, in the documentation and also renamed functions ppc_error_* instead of ppc_resid_*.