Frequencies for first 10,000 rows of drg6ing3 variable in nhamcsed1997 dataset :

 ingredient |
code #3 for |
    drug #6 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,996       99.96       99.96
      52908 |          1        0.01       99.97
      54465 |          1        0.01       99.98
      54960 |          1        0.01       99.99
      55745 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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