Frequencies for first 10,000 rows of drug6cl2 variable in nhamcsopd2002 dataset :

 drug class |
     #2 for |
 medication |
         #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,952       99.52       99.52
       0507 |          3        0.03       99.55
       0508 |          1        0.01       99.56
       0512 |          5        0.05       99.61
       0513 |          4        0.04       99.65
       0875 |          1        0.01       99.66
       0913 |          1        0.01       99.67
       1265 |          1        0.01       99.68
       1275 |          5        0.05       99.73
       1373 |          2        0.02       99.75
       1569 |          1        0.01       99.76
       1671 |          2        0.02       99.78
       1724 |         14        0.14       99.92
       1727 |          1        0.01       99.93
       1728 |          4        0.04       99.97
       1943 |          1        0.01       99.98
       1944 |          1        0.01       99.99
       1947 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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