Frequencies for first 10,000 rows of drg4ing4 variable in nhamcsopd1996 dataset :

 ingredient |
code #4 for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,990       99.90       99.90
      54468 |          1        0.01       99.91
      54713 |          1        0.01       99.92
      55490 |          1        0.01       99.93
      55710 |          1        0.01       99.94
      55755 |          4        0.04       99.98
      55770 |          1        0.01       99.99
      56265 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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