Frequencies for first 10,000 rows of drg3ing4 variable in nhamcsopd2005 dataset :

ingredient code #4 for medication #3 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                       potassium ion |          1        0.01        0.01
                          riboflavin |          1        0.01        0.02
                            thiamine |         15        0.15        0.17
                           vitamin a |          1        0.01        0.18
                           vitamin c |          1        0.01        0.19
                    abacavir sulfate |          1        0.01        0.20
           dextroamphetamine sulfate |          1        0.01        0.21
                         lipoic acid |          1        0.01        0.22
                     woolwax alcohol |          4        0.04        0.26
           filamentous hemagglutinin |          5        0.05        0.31
                           alteplase |          1        0.01        0.32
                                   . |      9,968       99.68      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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