Frequencies for first 10,000 rows of drg2ing4 variable in nhamcsopd2001 dataset :

 ingredient |
code #4 for |
 medication |
         #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,964       99.64       99.64
      54350 |          1        0.01       99.65
      54440 |          1        0.01       99.66
      55755 |         29        0.29       99.95
      56193 |          3        0.03       99.98
      70260 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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