Frequencies for first 10,000 rows of drg7ing3 variable in namcs2003 dataset :

 ingredient |
code #3 for |
 medication |
         #7 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,995       99.95       99.95
      55105 |          1        0.01       99.96
      56340 |          3        0.03       99.99
      56445 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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