Frequencies for first 10,000 rows of drg4ing3 variable in nhamcsopd1997 dataset :

 ingredient |
code #3 for |
 medication |
         #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,973       99.73       99.73
      50745 |          3        0.03       99.76
      53915 |          1        0.01       99.77
      54325 |          2        0.02       99.79
      54465 |          5        0.05       99.84
      55105 |          7        0.07       99.91
      55130 |          6        0.06       99.97
      55240 |          1        0.01       99.98
      55770 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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