Frequencies for first 10,000 rows of drug5cl3 variable in nhamcsopd2005 dataset :

          ndc code #3 for medication #5 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                         ace inhibitors |          1        0.01        0.01
                        anticonvulsants |          4        0.04        0.05
ocular anti-infective/anti-inflammatory |          1        0.01        0.06
              miscellaneous ophthalmics |          2        0.02        0.08
                           antipyretics |         46        0.46        0.54
   antitussives/expectorants/mucolytics |          1        0.01        0.55
                         antihistamines |          4        0.04        0.59
                                      . |      9,941       99.41      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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