Frequencies for first 10,000 rows of drg7ing4 variable in nhamcsopd2003 dataset :

  ingredient code #4 for medication |
                                 #7 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                    sodium chloride |          5        0.05        0.05
                           thiamine |          2        0.02        0.07
          dextroamphetamine sulfate |          1        0.01        0.08
                                  . |      9,992       99.92      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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