Frequencies for first 10,000 rows of drg6ing5 variable in nhamcsopd2003 dataset :

  ingredient code #5 for medication |
                                 #6 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                          vitamin a |          4        0.04        0.04
                                  . |      9,996       99.96      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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