Frequencies for cmivgroup variable in impact2006 dataset :

DRG Grouper |
Version for |
       cmiv |      Freq.     Percent        Cum.
------------+-----------------------------------
         23 |      3,824      100.00      100.00
------------+-----------------------------------
      Total |      3,824      100.00

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