Frequencies for first 10,000 rows of drug1cl3 variable in nhamcsed2005 dataset :

          ndc code #3 for medication #1 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                         ace inhibitors |          1        0.01        0.01
repl/regs of electrolytes/water balance |          2        0.02        0.03
                        anticonvulsants |         30        0.30        0.33
                cycloplegics/mydriatics |          3        0.03        0.36
ocular anti-infective/anti-inflammatory |         13        0.13        0.49
              miscellaneous ophthalmics |         10        0.10        0.59
                                  nsaid |          1        0.01        0.60
                           antipyretics |        136        1.36        1.96
         antiasthmatics/bronchodilators |         15        0.15        2.11
                         antihistamines |        240        2.40        4.51
                          cold remedies |         19        0.19        4.70
                          surgical aids |        191        1.91        6.61
                                      . |      9,339       93.39      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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