Frequencies for first 10,000 rows of drg2ing4 variable in nhamcsed1994 dataset :

 ingredient |
code #4 for |
    drug #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,954       99.54       99.54
      54238 |          1        0.01       99.55
      54465 |          1        0.01       99.56
      54468 |          6        0.06       99.62
      54713 |          4        0.04       99.66
      55105 |          5        0.05       99.71
      55180 |         27        0.27       99.98
      56020 |          1        0.01       99.99
      56194 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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