Frequencies for first 10,000 rows of drug7cl3 variable in nhamcsopd2003 dataset :

        drug class #3 for medication #7 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                        anticonvulsants |          2        0.02        0.02
                cycloplegics/mydriatics |          1        0.01        0.03
ocular anti-infective/anti-inflammatory |          2        0.02        0.05
                           antipyretics |         31        0.31        0.36
                          antimalarials |          1        0.01        0.37
                         antihistamines |          9        0.09        0.46
                                      . |      9,954       99.54      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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