Frequencies for first 10,000 rows of drg1ing4 variable in nhamcsopd1992 dataset :

 Ingredient |
code #4 for |
 medication |
         #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,983       99.83       99.83
      53325 |          1        0.01       99.84
      54468 |          3        0.03       99.87
      54595 |          1        0.01       99.88
      54713 |          1        0.01       99.89
      55180 |          4        0.04       99.93
      55315 |          1        0.01       99.94
      55645 |          2        0.02       99.96
      56194 |          1        0.01       99.97
      56265 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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