Frequencies for first 10,000 rows of drug6cl3 variable in nhamcsopd2002 dataset :

 drug class |
     #3 for |
 medication |
         #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,981       99.81       99.81
       1374 |          3        0.03       99.84
       1728 |         14        0.14       99.98
       1944 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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