Frequencies for first 10,000 rows of drg8ing4 variable in nhamcsed2004 dataset :

  ingredient code #4 for medication |
                                 #8 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                         riboflavin |          1        0.01        0.01
                           thiamine |          1        0.01        0.02
                          vitamin a |          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