Frequencies for first 10,000 rows of drug7cl3 variable in nhamcsed2003 dataset :

        drug class #3 for medication #7 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                         ace inhibitors |          1        0.01        0.01
repl/regs of electrolytes/water balance |          1        0.01        0.02
ocular anti-infective/anti-inflammatory |          1        0.01        0.03
                           antipyretics |          8        0.08        0.11
         antiasthmatics/bronchodilators |          1        0.01        0.12
                         antihistamines |          8        0.08        0.20
                                      . |      9,980       99.80      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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