Frequencies for first 10,000 rows of drg4ing5 variable in nhamcsopd2005 dataset :

ingredient code #5 for medication #4 |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                          sodium ion |          1        0.01        0.01
                           vitamin a |         11        0.11        0.12
                           vitamin e |          1        0.01        0.13
                                aloe |          2        0.02        0.15
                  sodium biphosphate |          1        0.01        0.16
                   proanthocyanidins |          1        0.01        0.17
                           pertactin |          1        0.01        0.18
                                   . |      9,982       99.82      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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