Frequencies for first 10,000 rows of drug7cl3 variable in nhamcsed2005 dataset :

          ndc code #3 for medication #7 |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                        anticonvulsants |          1        0.01        0.01
                cycloplegics/mydriatics |          1        0.01        0.02
                           antipyretics |          2        0.02        0.04
                         antihistamines |          4        0.04        0.08
                          cold remedies |          1        0.01        0.09
                                      . |      9,991       99.91      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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