Frequencies for first 10,000 rows of rx7v3c3 variable in nhamcsed2009 dataset :

   for rx7, |
 level 3 of |
multum drug |
category #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,991       99.91       99.91
        197 |          3        0.03       99.94
        203 |          5        0.05       99.99
        204 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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