Frequencies for first 10,000 rows of drugcl1 variable in nhamcsed1992 dataset :

 Drug class |
for drug #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      3,667       36.67       36.67
         01 |         82        0.82       37.49
         02 |         23        0.23       37.72
         03 |      1,349       13.49       51.21
         04 |         67        0.67       51.88
         05 |        348        3.48       55.36
         06 |        189        1.89       57.25
         07 |          3        0.03       57.28
         08 |        269        2.69       59.97
         09 |         95        0.95       60.92
         10 |        173        1.73       62.65
         11 |        269        2.69       65.34
         12 |        179        1.79       67.13
         13 |        101        1.01       68.14
         14 |          2        0.02       68.16
         15 |        100        1.00       69.16
         16 |         50        0.50       69.66
         17 |      2,165       21.65       91.31
         18 |         11        0.11       91.42
         19 |        604        6.04       97.46
         20 |        254        2.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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