Frequencies for first 10,000 rows of drg2ing4 variable in namcs1999 dataset :

 ingredient |
code #4 for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,981       99.81       99.81
      53640 |          6        0.06       99.87
      53720 |          1        0.01       99.88
      54440 |          1        0.01       99.89
      54455 |          1        0.01       99.90
      54595 |          2        0.02       99.92
      54700 |          1        0.01       99.93
      55105 |          1        0.01       99.94
      55490 |          1        0.01       99.95
      55710 |          1        0.01       99.96
      55755 |          2        0.02       99.98
      55770 |          1        0.01       99.99
      56265 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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