Frequencies for first 10,000 rows of drg5ing3 variable in nhamcsopd2005 dataset :

ingredient code #3 for medication #5 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                isometheptene mucate |          1        0.01        0.01
                          petrolatum |          1        0.01        0.02
                          riboflavin |          2        0.02        0.04
               rubella virus vaccine |          1        0.01        0.05
                       safflower oil |          1        0.01        0.06
                          sodium ion |          1        0.01        0.07
                            thiamine |          1        0.01        0.08
   zinc topical agents, external use |          1        0.01        0.09
                           vitamin b |          1        0.01        0.10
                 magnesium hydroxide |          1        0.01        0.11
            chlorpheniramine maleate |          1        0.01        0.12
                 butyl aminobenzoate |          1        0.01        0.13
                     tetanus vaccine |          2        0.02        0.15
                         mineral wax |          1        0.01        0.16
                     pertussis toxin |          1        0.01        0.17
                                   . |      9,983       99.83      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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