Frequencies for first 10,000 rows of drg8ing4 variable in nhamcsopd2003 dataset :

  ingredient code #4 for medication |
                                 #8 |      Freq.     Percent        Cum.
------------------------------------+-----------------------------------
                    sodium chloride |          3        0.03        0.03
                     sodium sulfate |          1        0.01        0.04
                           thiamine |          1        0.01        0.05
                                  . |      9,995       99.95      100.00
------------------------------------+-----------------------------------
                              Total |     10,000      100.00

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