Frequencies for first 10,000 rows of drg2ing5 variable in nhamcsopd1997 dataset :

 ingredient |
code #5 for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,959       99.59       99.59
      55273 |          1        0.01       99.60
      55348 |          1        0.01       99.61
      56185 |         38        0.38       99.99
      57170 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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