Frequencies for first 10,000 rows of drg6ing4 variable in namcs2004 dataset :

 ingredient |
code #4 for |
 medication |
         #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,995       99.95       99.95
      55105 |          1        0.01       99.96
      55755 |          3        0.03       99.99
      70753 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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