Frequencies for first 10,000 rows of drug4cl3 variable in nhamcsopd2004 dataset :

        drug class #3 for medication #4 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                         ace inhibitors |          1        0.01        0.01
repl/regs of electrolytes/water balance |          1        0.01        0.02
                        anticonvulsants |          3        0.03        0.05
                cycloplegics/mydriatics |          1        0.01        0.06
ocular anti-infective/anti-inflammatory |          2        0.02        0.08
                           antipyretics |         70        0.70        0.78
                         antihistamines |          7        0.07        0.85
                          cold remedies |          1        0.01        0.86
                          surgical aids |          8        0.08        0.94
                                      . |      9,906       99.06      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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