Frequencies for first 10,000 rows of drg3ing4 variable in nhamcsopd1993 dataset :

 ingredient |
code #4 for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,994       99.94       99.94
      54468 |          2        0.02       99.96
      55105 |          1        0.01       99.97
      55180 |          1        0.01       99.98
      55645 |          1        0.01       99.99
      55770 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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