Frequencies for first 10,000 rows of rx7cat4 variable in nhamcsopd2011 dataset :

   For RX7, |
MULTUM drug |
category #4 |
     - most |
   detailed |
 level (can |
  be either |
 Level 1,2  |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,994       99.94       99.94
        205 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016