Frequencies for first 10,000 rows of drug7cl3 variable in nhamcsed2004 dataset :

        drug class #3 for medication #7 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                        anticonvulsants |          2        0.02        0.02
ocular anti-infective/anti-inflammatory |          3        0.03        0.05
                           antipyretics |         13        0.13        0.18
                         antihistamines |          9        0.09        0.27
                          surgical aids |          6        0.06        0.33
                                      . |      9,967       99.67      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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