Frequencies for first 10,000 rows of drg7ing3 variable in nhamcsopd2004 dataset :

  ingredient code #3 for medication |
                                 #7 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                         riboflavin |          3        0.03        0.03
                 potassium chloride |          1        0.01        0.04
                butyl aminobenzoate |          1        0.01        0.05
                    tetanus vaccine |          1        0.01        0.06
                                  . |      9,994       99.94      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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