Frequencies for first 10,000 rows of rx2v3c3 variable in nhamcsopd2009 dataset :

   for rx2, |
 level 3 of |
multum drug |
category #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,938       99.38       99.38
        185 |         11        0.11       99.49
        197 |         20        0.20       99.69
        203 |         31        0.31      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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