Frequencies for first 10,000 rows of drg2ing4 variable in nhamcsopd1998 dataset :

 ingredient |
code #4 for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,976       99.76       99.76
      54468 |          2        0.02       99.78
      54713 |          2        0.02       99.80
      55710 |          2        0.02       99.82
      55745 |          2        0.02       99.84
      55755 |         10        0.10       99.94
      56193 |          1        0.01       99.95
      56194 |          2        0.02       99.97
      56265 |          1        0.01       99.98
      57170 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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