Frequencies for first 10,000 rows of drug2cl3 variable in nhamcsopd2002 dataset :

 drug class |
     #3 for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,894       98.94       98.94
       1275 |          1        0.01       98.95
       1374 |         18        0.18       99.13
       1479 |          1        0.01       99.14
       1567 |          3        0.03       99.17
       1568 |          6        0.06       99.23
       1727 |          1        0.01       99.24
       1728 |         55        0.55       99.79
       1940 |          5        0.05       99.84
       1944 |         13        0.13       99.97
       1945 |          2        0.02       99.99
       2095 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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