Frequencies for first 10,000 rows of drg4ing3 variable in nhamcsed1993 dataset :

 ingredient |
code #3 for |
    drug #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,990       99.90       99.90
      51130 |          1        0.01       99.91
      54395 |          3        0.03       99.94
      54465 |          2        0.02       99.96
      54595 |          2        0.02       99.98
      55240 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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