Frequencies for casetagroup variable in impact2001 dataset :

DRG Grouper |
Version for |
     caseta |      Freq.     Percent        Cum.
------------+-----------------------------------
         18 |      4,983      100.00      100.00
------------+-----------------------------------
      Total |      4,983      100.00

by Jean Roth , jroth@nber.org , 17 Mar 2016