Frequencies for first 10,000 rows of drg1ing5 variable in nhamcsed1993 dataset :

 ingredient |
code #5 for |
    drug #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,985       99.85       99.85
      54305 |          1        0.01       99.86
      55180 |          1        0.01       99.87
      55348 |         13        0.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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