Frequencies for first 10,000 rows of drg1ing5 variable in nhamcsed1997 dataset :

 ingredient |
code #5 for |
    drug #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,971       99.71       99.71
      54180 |          1        0.01       99.72
      54305 |          1        0.01       99.73
      55348 |         18        0.18       99.91
      56185 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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