Frequencies for first 10,000 rows of drg1ing4 variable in nhamcsopd2003 dataset :

  ingredient code #4 for medication |
                                 #1 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                      potassium ion |          5        0.05        0.05
                         riboflavin |          2        0.02        0.07
                    sodium chloride |          7        0.07        0.14
                           thiamine |        167        1.67        1.81
                       vitamin b-12 |          1        0.01        1.82
  zinc topical agents, external use |          1        0.01        1.83
                                fat |          1        0.01        1.84
          dextroamphetamine sulfate |         35        0.35        2.19
                diphenhydramine hcl |          1        0.01        2.20
                   neomycin sulfate |          1        0.01        2.21
        acellular pertussis vaccine |          1        0.01        2.22
                    woolwax alcohol |          4        0.04        2.26
         propylene glycol diacetate |          1        0.01        2.27
          filamentous hemagglutinin |          6        0.06        2.33
                                  . |      9,767       97.67      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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