Frequencies for first 10,000 rows of drg3ing4 variable in namcs1997 dataset :

 ingredient |
code #4 for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,984       99.84       99.84
      51340 |          1        0.01       99.85
      53640 |          1        0.01       99.86
      54465 |          1        0.01       99.87
      54468 |          1        0.01       99.88
      55490 |          1        0.01       99.89
      55645 |          2        0.02       99.91
      55755 |          4        0.04       99.95
      55770 |          1        0.01       99.96
      56185 |          1        0.01       99.97
      56193 |          1        0.01       99.98
      56194 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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