Reference

All functions
center_grand_mean()	Center with respect to grand mean
center_group_mean()	Center with respect to group mean
center_mlm()	Centering for multilevel analyses
composite_score()	Composite column
dummy_coding()	Dummy Coding
effect_coding()	Effect Coding
listwise_deletion()	Listwise deletion
mlbook_data	mlbook_data
recode_item()	Recode values of a data frame
summarize_missing_values()	Count the number of missing values
z_scored_grand_mean()	Grand mean z-score
z_scored_group_mean()	Z scored with with respect to the group mean
z_scored_mlm()	Z-scored for multilevel analyses
z_scored_mlm_categorical()	Z-scored for multilevel analyses