Frequencies for first 10,000 rows of drg3ing4 variable in nhamcsopd1996 dataset :

 ingredient |
code #4 for |
 medication |
         #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,973       99.73       99.73
      51340 |          1        0.01       99.74
      54468 |          1        0.01       99.75
      55105 |          2        0.02       99.77
      55710 |          5        0.05       99.82
      55755 |         14        0.14       99.96
      55770 |          1        0.01       99.97
      56193 |          1        0.01       99.98
      56265 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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