Frequencies for first 10,000 rows of drg2ing4 variable in nhamcsed1995 dataset :

 ingredient |
code #4 for |
    drug #2 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,956       99.56       99.56
      54455 |          1        0.01       99.57
      54468 |          1        0.01       99.58
      54595 |          1        0.01       99.59
      54713 |          6        0.06       99.65
      54995 |          1        0.01       99.66
      55105 |          1        0.01       99.67
      55180 |         28        0.28       99.95
      55440 |          1        0.01       99.96
      55755 |          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