Frequencies for first 10,000 rows of drg4ing3 variable in namcs1998 dataset :

 ingredient |
code #3 for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,979       99.79       99.79
      50745 |          1        0.01       99.80
      52908 |          2        0.02       99.82
      53175 |          2        0.02       99.84
      54328 |          1        0.01       99.85
      54395 |          2        0.02       99.87
      54465 |          1        0.01       99.88
      54860 |          1        0.01       99.89
      54995 |          2        0.02       99.91
      55130 |          6        0.06       99.97
      56185 |          1        0.01       99.98
      56195 |          1        0.01       99.99
      57058 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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