Frequencies for first 10,000 rows of drug1cl3 variable in nhamcsopd2002 dataset :

 drug class |
     #3 for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,870       98.70       98.70
       0514 |          2        0.02       98.72
       1268 |          1        0.01       98.73
       1275 |          1        0.01       98.74
       1374 |         28        0.28       99.02
       1567 |          3        0.03       99.05
       1568 |         16        0.16       99.21
       1569 |          1        0.01       99.22
       1670 |          1        0.01       99.23
       1724 |          1        0.01       99.24
       1727 |          2        0.02       99.26
       1728 |         56        0.56       99.82
       1941 |          1        0.01       99.83
       1943 |          2        0.02       99.85
       1944 |          7        0.07       99.92
       1945 |          6        0.06       99.98
       2095 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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