Frequencies for first 10,000 rows of drug4cl3 variable in nhamcsed2005 dataset :

          ndc code #3 for medication #4 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                     topical analgesics |          1        0.01        0.01
                        anticonvulsants |          4        0.04        0.05
                cycloplegics/mydriatics |          1        0.01        0.06
ocular anti-infective/anti-inflammatory |          1        0.01        0.07
                   otic, topical (misc) |          1        0.01        0.08
                                  nsaid |          1        0.01        0.09
                           antipyretics |         23        0.23        0.32
                          antimalarials |          1        0.01        0.33
         antiasthmatics/bronchodilators |          1        0.01        0.34
                         antihistamines |         60        0.60        0.94
                          cold remedies |          4        0.04        0.98
                    pharmaceutical aids |          1        0.01        0.99
                          surgical aids |         32        0.32        1.31
                                      . |      9,869       98.69      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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