Frequencies for first 10,000 rows of rx2v1c3 variable in nhamcsopd2009 dataset :

   for rx2, |
 level 1 of |
multum drug |
category #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,931       99.31       99.31
        040 |          1        0.01       99.32
        057 |         51        0.51       99.83
        097 |         11        0.11       99.94
        105 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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