Frequencies for first 10,000 rows of rx4v1c3 variable in nhamcsopd2007 dataset :

   for rx4, |
 level 1 of |
multum drug |
category #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,953       99.53       99.53
        057 |         38        0.38       99.91
        097 |          3        0.03       99.94
        105 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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