Frequencies for first 10,000 rows of drg3ing4 variable in nhamcsopd2003 dataset :

  ingredient code #4 for medication |
                                 #3 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                       electrolytes |          1        0.01        0.01
                phenylpropanolamine |          1        0.01        0.02
                    sodium chloride |          8        0.08        0.10
                           thiamine |         12        0.12        0.22
  zinc topical agents, external use |          1        0.01        0.23
          dextroamphetamine sulfate |          8        0.08        0.31
             hydrocortisone acetate |          1        0.01        0.32
                           d-biotin |          1        0.01        0.33
                                  . |      9,967       99.67      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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