Frequencies for first 10,000 rows of drg4ing5 variable in nhamcsed2003 dataset :

  ingredient code #5 for medication |
                                 #4 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                         sodium ion |          1        0.01        0.01
                          vitamin a |          1        0.01        0.02
                                  . |      9,998       99.98      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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