Frequencies for first 10,000 rows of drg2ing4 variable in nhamcsed1998 dataset :

 ingredient |
code #4 for |
    drug #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,971       99.71       99.71
      54455 |          1        0.01       99.72
      54468 |          2        0.02       99.74
      54713 |          4        0.04       99.78
      55180 |         17        0.17       99.95
      55755 |          2        0.02       99.97
      56020 |          1        0.01       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