Frequencies for first 10,000 rows of drg6ing3 variable in nhamcsed2003 dataset :

  ingredient code #3 for medication |
                                 #6 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                           caffeine |          1        0.01        0.01
                         riboflavin |          1        0.01        0.02
                       theophylline |          1        0.01        0.03
                  vitamin b complex |          1        0.01        0.04
                                  . |      9,996       99.96      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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