Frequencies for first 10,000 rows of drugcl4 variable in nhamcsopd1992 dataset :

 Drug class |
        for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,206       92.06       92.06
         01 |          5        0.05       92.11
         02 |          1        0.01       92.12
         03 |         45        0.45       92.57
         04 |         22        0.22       92.79
         05 |        177        1.77       94.56
         06 |         60        0.60       95.16
         07 |         10        0.10       95.26
         08 |         40        0.40       95.66
         09 |         64        0.64       96.30
         10 |         58        0.58       96.88
         11 |         30        0.30       97.18
         12 |         17        0.17       97.35
         13 |         14        0.14       97.49
         14 |         10        0.10       97.59
         15 |         22        0.22       97.81
         16 |          4        0.04       97.85
         17 |         91        0.91       98.76
         18 |          2        0.02       98.78
         19 |         63        0.63       99.41
         20 |         59        0.59      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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