Frequencies for first 10,000 rows of rx2cat3 variable in nhamcsopd2007 dataset :

   for rx2, |
multum drug |
category #3 |
 - detailed |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,948       99.48       99.48
        185 |          5        0.05       99.53
        197 |         19        0.19       99.72
        203 |         24        0.24       99.96
        270 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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