Frequencies for first 10,000 rows of drg4ing4 variable in nhamcsed2001 dataset :

 ingredient |
code #4 for |
    drug #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,994       99.94       99.94
      54713 |          1        0.01       99.95
      55755 |          1        0.01       99.96
      56161 |          1        0.01       99.97
      70120 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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