Frequencies for first 10,000 rows of drg2ing5 variable in namcs1994 dataset :

 ingredient |
code #5 for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,979       99.79       99.79
      54440 |          1        0.01       99.80
      55320 |          2        0.02       99.82
      55348 |          2        0.02       99.84
      55755 |          1        0.01       99.85
      55770 |          1        0.01       99.86
      55893 |          1        0.01       99.87
      56192 |          9        0.09       99.96
      56193 |          3        0.03       99.99
      56265 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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