Frequencies for first 10,000 rows of drg8ing4 variable in nhamcsopd2005 dataset :

ingredient code #4 for medication #8 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                        chlorothymol |          1        0.01        0.01
                           quercetin |          1        0.01        0.02
           dextroamphetamine sulfate |          1        0.01        0.03
                                   . |      9,997       99.97      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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