Frequencies for first 10,000 rows of drg3ing4 variable in namcs2001 dataset :

 ingredient |
code #4 for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,986       99.86       99.86
      54440 |          1        0.01       99.87
      55105 |          1        0.01       99.88
      55755 |          4        0.04       99.92
      56185 |          1        0.01       99.93
      56192 |          1        0.01       99.94
      70244 |          1        0.01       99.95
      70247 |          1        0.01       99.96
      70260 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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