Frequencies for first 10,000 rows of drg3ing4 variable in nhamcsed2000 dataset :

 ingredient |
code #4 for |
    drug #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,981       99.81       99.81
      54295 |          1        0.01       99.82
      54455 |          1        0.01       99.83
      54465 |          1        0.01       99.84
      54713 |          4        0.04       99.88
      54995 |          1        0.01       99.89
      55180 |          8        0.08       99.97
      55315 |          2        0.02       99.99
      55755 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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