Frequencies for first 10,000 rows of drg3ing4 variable in nhamcsopd1995 dataset :

 ingredient |
code #4 for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,983       99.83       99.83
      54455 |          1        0.01       99.84
      54465 |          1        0.01       99.85
      55105 |          1        0.01       99.86
      55180 |          1        0.01       99.87
      55710 |          3        0.03       99.90
      55755 |          6        0.06       99.96
      55770 |          2        0.02       99.98
      56194 |          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