Frequencies for first 10,000 rows of rx4v1c3 variable in nhamcsopd2009 dataset :

   for rx4, |
 level 1 of |
multum drug |
category #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,958       99.58       99.58
        040 |          2        0.02       99.60
        057 |         27        0.27       99.87
        097 |         10        0.10       99.97
        105 |          1        0.01       99.98
        113 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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