Frequencies for first 10,000 rows of drug7cl3 variable in nhamcsopd2005 dataset :

          ndc code #3 for medication #7 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                        anticonvulsants |          2        0.02        0.02
                           antipyretics |         26        0.26        0.28
         antiasthmatics/bronchodilators |          1        0.01        0.29
                         antihistamines |          3        0.03        0.32
                          surgical aids |          1        0.01        0.33
                                      . |      9,967       99.67      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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