Frequencies for first 10,000 rows of drg4ing4 variable in nhamcsopd1995 dataset :

 ingredient |
code #4 for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,989       99.89       99.89
      51340 |          1        0.01       99.90
      54350 |          1        0.01       99.91
      55105 |          1        0.01       99.92
      55218 |          1        0.01       99.93
      55645 |          1        0.01       99.94
      55755 |          3        0.03       99.97
      55770 |          2        0.02       99.99
      56193 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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