Frequencies for first 10,000 rows of drg2ing4 variable in nhamcsed2001 dataset :

 ingredient |
code #4 for |
    drug #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,974       99.74       99.74
      54713 |          6        0.06       99.80
      55755 |          4        0.04       99.84
      55801 |          1        0.01       99.85
      70011 |          1        0.01       99.86
      70120 |         13        0.13       99.99
      70233 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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