Frequencies for first 10,000 rows of drg1ing4 variable in nhamcsed1992 dataset :

 Ingredient |
code #4 for |
    drug #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,942       99.42       99.42
      51340 |          2        0.02       99.44
      54238 |          2        0.02       99.46
      54465 |          1        0.01       99.47
      54468 |          5        0.05       99.52
      54595 |          5        0.05       99.57
      54713 |         16        0.16       99.73
      55180 |         22        0.22       99.95
      55198 |          1        0.01       99.96
      55645 |          2        0.02       99.98
      56265 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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