Frequencies for first 10,000 rows of drg3ing4 variable in namcs1999 dataset :

 ingredient |
code #4 for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,987       99.87       99.87
      54440 |          1        0.01       99.88
      54468 |          1        0.01       99.89
      54713 |          1        0.01       99.90
      54895 |          2        0.02       99.92
      55105 |          1        0.01       99.93
      55180 |          1        0.01       99.94
      55435 |          4        0.04       99.98
      55490 |          1        0.01       99.99
      55645 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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