Frequencies for first 10,000 rows of drug4cl3 variable in nhamcsed2003 dataset :

        drug class #3 for medication #4 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                         ace inhibitors |          1        0.01        0.01
repl/regs of electrolytes/water balance |          3        0.03        0.04
                        anticonvulsants |          8        0.08        0.12
ocular anti-infective/anti-inflammatory |          2        0.02        0.14
                           antipyretics |         27        0.27        0.41
         antiasthmatics/bronchodilators |          3        0.03        0.44
                         antihistamines |         54        0.54        0.98
                          cold remedies |          2        0.02        1.00
                                      . |      9,900       99.00      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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