Frequencies for first 10,000 rows of rx2v2c4 variable in nhamcsopd2010 dataset :

   for rx2, |
 level 2 of |
multum drug |
category #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,953       99.53       99.53
        066 |         40        0.40       99.93
        104 |          6        0.06       99.99
        120 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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