Frequencies for first 10,000 rows of drg2ing4 variable in nhamcsed1993 dataset :

 ingredient |
code #4 for |
    drug #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,944       99.44       99.44
      53640 |          1        0.01       99.45
      54330 |          1        0.01       99.46
      54465 |          1        0.01       99.47
      54595 |          2        0.02       99.49
      54713 |         11        0.11       99.60
      55180 |         35        0.35       99.95
      55770 |          1        0.01       99.96
      56020 |          2        0.02       99.98
      56192 |          1        0.01       99.99
      56265 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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