Frequencies for first 10,000 rows of rx4v1c2 variable in nhamcsed2009 dataset :

   for rx4, |
 level 1 of |
multum drug |
category #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,666       96.66       96.66
        001 |         50        0.50       97.16
        040 |         47        0.47       97.63
        057 |         94        0.94       98.57
        081 |         15        0.15       98.72
        097 |          6        0.06       98.78
        105 |          2        0.02       98.80
        115 |          7        0.07       98.87
        122 |         94        0.94       99.81
        133 |          7        0.07       99.88
        242 |         11        0.11       99.99
        358 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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