Frequencies for first 10,000 rows of drg3ing4 variable in nhamcsed2002 dataset :

 ingredient |
code #4 for |
    drug #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,983       99.83       99.83
      53175 |          1        0.01       99.84
      54713 |          3        0.03       99.87
      55405 |          1        0.01       99.88
      55755 |          4        0.04       99.92
      70336 |          5        0.05       99.97
      70434 |          2        0.02       99.99
      70668 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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