Frequencies for first 10,000 rows of drg3ing5 variable in nhamcsopd2005 dataset :

ingredient code #5 for medication #3 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                          sodium ion |          1        0.01        0.01
                            thiamine |          1        0.01        0.02
                           vitamin a |         15        0.15        0.17
                           vitamin c |          1        0.01        0.18
                            vanadium |          1        0.01        0.19
                           pertactin |          5        0.05        0.24
                                   . |      9,976       99.76      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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