Frequencies for first 10,000 rows of drg1ing4 variable in nhamcsed1998 dataset :

 ingredient |
code #4 for |
    drug #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,955       99.55       99.55
      51340 |          1        0.01       99.56
      53620 |          1        0.01       99.57
      54465 |          2        0.02       99.59
      54468 |          2        0.02       99.61
      54713 |         15        0.15       99.76
      54995 |          2        0.02       99.78
      55105 |          1        0.01       99.79
      55180 |         15        0.15       99.94
      55645 |          1        0.01       99.95
      55755 |          3        0.03       99.98
      56265 |          1        0.01       99.99
      57170 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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