Frequencies for first 10,000 rows of drg4ing5 variable in namcs2005 dataset :

 ingredient |
code #5 for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,984       99.84       99.84
      55160 |          1        0.01       99.85
      55755 |          1        0.01       99.86
      56185 |          9        0.09       99.95
      56195 |          2        0.02       99.97
      70327 |          1        0.01       99.98
      70709 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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