Frequencies for first 10,000 rows of drugcl1 variable in nhamcsopd1992 dataset :

 Drug class |
        for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      5,018       50.18       50.18
         01 |         26        0.26       50.44
         02 |          2        0.02       50.46
         03 |        755        7.55       58.01
         04 |        152        1.52       59.53
         05 |        578        5.78       65.31
         06 |        288        2.88       68.19
         07 |         61        0.61       68.80
         08 |        193        1.93       70.73
         09 |        250        2.50       73.23
         10 |        538        5.38       78.61
         11 |        340        3.40       82.01
         12 |        236        2.36       84.37
         13 |         94        0.94       85.31
         14 |         66        0.66       85.97
         15 |        134        1.34       87.31
         16 |         26        0.26       87.57
         17 |        610        6.10       93.67
         18 |          6        0.06       93.73
         19 |        307        3.07       96.80
         20 |        320        3.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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