Frequencies for casetagroup variable in impact2013 dataset :

DRG Grouper |
Version for |
     caseta |      Freq.     Percent        Cum.
------------+-----------------------------------
         30 |      3,500      100.00      100.00
------------+-----------------------------------
      Total |      3,500      100.00

by Jean Roth , jroth@nber.org , 16 Dec 2016