Frequencies for first 10,000 rows of drug5cl3 variable in nhamcsopd2002 dataset :

 drug class |
     #3 for |
 medication |
         #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,973       99.73       99.73
       0915 |          1        0.01       99.74
       1374 |          4        0.04       99.78
       1567 |          1        0.01       99.79
       1728 |         19        0.19       99.98
       1941 |          1        0.01       99.99
       1944 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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