Frequencies for first 10,000 rows of drg4ing4 variable in namcs2005 dataset :

 ingredient |
code #4 for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,981       99.81       99.81
      51105 |          1        0.01       99.82
      55105 |          1        0.01       99.83
      55755 |          9        0.09       99.92
      56193 |          2        0.02       99.94
      56194 |          1        0.01       99.95
      70260 |          2        0.02       99.97
      70326 |          1        0.01       99.98
      70708 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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