Frequencies for first 10,000 rows of drg4ing4 variable in nhamcsed2003 dataset :

  ingredient code #4 for medication |
                                 #4 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                      potassium ion |          1        0.01        0.01
                           thiamine |          1        0.01        0.02
                hyoscyamine sulfate |          5        0.05        0.07
                                  . |      9,993       99.93      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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