Frequencies for first 10,000 rows of drg4ing4 variable in nhamcsed1994 dataset :

 ingredient |
code #4 for |
    drug #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,986       99.86       99.86
      54148 |          1        0.01       99.87
      54238 |          2        0.02       99.89
      54465 |          1        0.01       99.90
      54713 |          4        0.04       99.94
      55105 |          2        0.02       99.96
      55180 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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