Frequencies for first 10,000 rows of rx2v1c2 variable in nhamcsed2009 dataset :

   for rx2, |
 level 1 of |
multum drug |
category #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,054       90.54       90.54
        001 |         97        0.97       91.51
        040 |        160        1.60       93.11
        057 |        310        3.10       96.21
        081 |         65        0.65       96.86
        097 |          3        0.03       96.89
        105 |          6        0.06       96.95
        113 |          2        0.02       96.97
        115 |         11        0.11       97.08
        122 |        253        2.53       99.61
        133 |         22        0.22       99.83
        218 |          1        0.01       99.84
        242 |         16        0.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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