Frequencies for first 10,000 rows of drg2ing4 variable in nhamcsed1999 dataset :

 ingredient |
code #4 for |
    drug #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,959       99.59       99.59
      54400 |          1        0.01       99.60
      54468 |          2        0.02       99.62
      54595 |          2        0.02       99.64
      54713 |          8        0.08       99.72
      55105 |          1        0.01       99.73
      55180 |         22        0.22       99.95
      55755 |          4        0.04       99.99
      56135 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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