Frequencies for first 10,000 rows of drg2ing4 variable in namcs2004 dataset :

 ingredient |
code #4 for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,961       99.61       99.61
      53175 |          1        0.01       99.62
      54440 |          2        0.02       99.64
      54895 |          1        0.01       99.65
      55105 |          1        0.01       99.66
      55150 |          1        0.01       99.67
      55315 |          1        0.01       99.68
      55440 |          1        0.01       99.69
      55755 |          5        0.05       99.74
      56193 |          1        0.01       99.75
      56265 |          1        0.01       99.76
      70260 |         11        0.11       99.87
      70326 |          1        0.01       99.88
      70336 |          3        0.03       99.91
      70440 |          1        0.01       99.92
      70668 |          1        0.01       99.93
      70691 |          2        0.02       99.95
      70708 |          1        0.01       99.96
      70854 |          2        0.02       99.98
      70858 |          1        0.01       99.99
      70945 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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