Frequencies for first 10,000 rows of drg7ing4 variable in nhamcsed2004 dataset :

  ingredient code #4 for medication |
                                 #7 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                           thiamine |          3        0.03        0.03
                hyoscyamine sulfate |          3        0.03        0.06
                                  . |      9,994       99.94      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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