Frequencies for first 10,000 rows of drg5ing4 variable in nhamcsopd2001 dataset :

 ingredient |
code #4 for |
 medication |
         #5 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,995       99.95       99.95
      55440 |          1        0.01       99.96
      55755 |          1        0.01       99.97
      56193 |          2        0.02       99.99
      70326 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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