Frequencies for first 10,000 rows of drg6ing4 variable in nhamcsopd2005 dataset :

ingredient code #4 for medication #6 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                            thiamine |          2        0.02        0.02
                           vitamin c |          1        0.01        0.03
   zinc topical agents, external use |          1        0.01        0.04
                   vitamin b complex |          1        0.01        0.05
                   codeine phosphate |          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