Frequencies for first 10,000 rows of drg7ing5 variable in nhamcsopd2004 dataset :

  ingredient code #5 for medication |
                                 #7 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                          vitamin a |          2        0.02        0.02
                       vitamin b-12 |          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