Frequencies for first 10,000 rows of drg3ing4 variable in nhamcsed1995 dataset :

 ingredient |
code #4 for |
    drug #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,974       99.74       99.74
      54468 |          2        0.02       99.76
      54595 |          1        0.01       99.77
      54713 |          2        0.02       99.79
      55180 |         15        0.15       99.94
      55755 |          2        0.02       99.96
      56185 |          3        0.03       99.99
      56265 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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