Frequencies for first 10,000 rows of drug5cl3 variable in nhamcsed2005 dataset :

          ndc code #3 for medication #5 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
               calcium channel blockers |          1        0.01        0.01
                        anticonvulsants |          2        0.02        0.03
              miscellaneous ophthalmics |          1        0.01        0.04
                                  nsaid |          1        0.01        0.05
                           antipyretics |         12        0.12        0.17
         antiasthmatics/bronchodilators |          1        0.01        0.18
                         antihistamines |         24        0.24        0.42
                          cold remedies |          3        0.03        0.45
                          surgical aids |         21        0.21        0.66
                                      . |      9,934       99.34      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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