Frequencies for first 10,000 rows of drg5ing4 variable in nhamcsopd2003 dataset :

  ingredient code #4 for medication |
                                 #5 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                      potassium ion |          1        0.01        0.01
                    sodium chloride |          4        0.04        0.05
                           thiamine |          4        0.04        0.09
                       vitamin b-12 |          1        0.01        0.10
          dextroamphetamine sulfate |          1        0.01        0.11
                hyoscyamine sulfate |          1        0.01        0.12
                                  . |      9,988       99.88      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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