Frequencies for first 10,000 rows of drg4ing4 variable in nhamcsopd2004 dataset :

  ingredient code #4 for medication |
                                 #4 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                          pramoxine |          1        0.01        0.01
                       salicylamide |          1        0.01        0.02
                    sodium chloride |          1        0.01        0.03
                           thiamine |          9        0.09        0.12
                          vitamin a |          1        0.01        0.13
          dextroamphetamine sulfate |          3        0.03        0.16
                        lipoic acid |          1        0.01        0.17
          filamentous hemagglutinin |          1        0.01        0.18
                           d-biotin |          1        0.01        0.19
                                  . |      9,981       99.81      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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