Frequencies for first 10,000 rows of drg2ing4 variable in nhamcsed2000 dataset :

 ingredient |
code #4 for |
    drug #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,972       99.72       99.72
      53325 |          1        0.01       99.73
      54330 |          1        0.01       99.74
      54713 |          4        0.04       99.78
      55105 |          1        0.01       99.79
      55180 |         16        0.16       99.95
      55315 |          1        0.01       99.96
      55755 |          3        0.03       99.99
      56193 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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