Frequencies for first 10,000 rows of drug1cl3 variable in nhamcsed2003 dataset :

        drug class #3 for medication #1 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                         ace inhibitors |          1        0.01        0.01
repl/regs of electrolytes/water balance |          2        0.02        0.03
                          immune serums |          3        0.03        0.06
                     topical analgesics |          1        0.01        0.07
                        anticonvulsants |         41        0.41        0.48
ocular anti-infective/anti-inflammatory |         15        0.15        0.63
              miscellaneous ophthalmics |          6        0.06        0.69
                   otic, topical (misc) |          1        0.01        0.70
                                  nsaid |          2        0.02        0.72
                           antipyretics |        120        1.20        1.92
         antiasthmatics/bronchodilators |         15        0.15        2.07
                         antihistamines |        226        2.26        4.33
                          cold remedies |         18        0.18        4.51
                                      . |      9,549       95.49      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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