Frequencies for first 10,000 rows of drg2ing4 variable in nhamcsed1996 dataset :

 ingredient |
code #4 for |
    drug #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,953       99.53       99.53
      51340 |          1        0.01       99.54
      53640 |          1        0.01       99.55
      54465 |          2        0.02       99.57
      54468 |          2        0.02       99.59
      54713 |          7        0.07       99.66
      55105 |          1        0.01       99.67
      55180 |         27        0.27       99.94
      55645 |          1        0.01       99.95
      55755 |          2        0.02       99.97
      55770 |          2        0.02       99.99
      56265 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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