perc_diff |
Calculate percentile differences from an ordered categorical variable and a continuous variable. |
perc_diff_df |
Calculate percentile differences from an ordered categorical variable and a continuous variable. |
perc_dist |
Calculate a distribution of percentiles from an ordered categorical variable and a continuous variable. |
pisa_2006 |
Mathematics test scores of Spain, Germany and Estonia in the PISA 2006 test |
pisa_2012 |
Mathematics test scores of Spain, Germany and Estonia in the PISA 2012 test |