B.3 The augment() function

The a

B.3.1 Chi-square tests

Using augment() on a chi-square object will print out a dataframe containing both the expected and the observed proportions for each cell.

augment(properties_chisq)

B.3.2 Regressions

augment() is probably most useful for regression models. It will print out the following:

• .fitted is the predicted score for each participant
• .resid is the residual for each participant (i.e. actual - fitted)
• .cooksd is Cook’s distance, which is useful for outlier detection in some contexts

augment(marketing_lm)