Frequencies for first 10,000 rows of drg2ing4 variable in nhamcsed1997 dataset :

 ingredient |
code #4 for |
    drug #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,963       99.63       99.63
      52465 |          1        0.01       99.64
      54468 |          2        0.02       99.66
      54595 |          1        0.01       99.67
      54713 |         15        0.15       99.82
      55180 |         16        0.16       99.98
      55315 |          1        0.01       99.99
      55755 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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