Frequencies for first 10,000 rows of drg4ing4 variable in nhamcsopd2005 dataset :

ingredient code #4 for medication #4 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                          petrolatum |          2        0.02        0.02
                   phenyl salicylate |          1        0.01        0.03
                       potassium ion |          1        0.01        0.04
                            thiamine |         11        0.11        0.15
                           vitamin c |          2        0.02        0.17
                           quercetin |          1        0.01        0.18
           dextroamphetamine sulfate |          4        0.04        0.22
                     woolwax alcohol |          1        0.01        0.23
           filamentous hemagglutinin |          1        0.01        0.24
                                   . |      9,976       99.76      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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