Frequencies for first 10,000 rows of drg4ing3 variable in nhamcsed2001 dataset :

 ingredient |
code #3 for |
    drug #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,984       99.84       99.84
      53175 |          1        0.01       99.85
      54000 |          1        0.01       99.86
      54305 |          1        0.01       99.87
      54455 |          1        0.01       99.88
      54465 |          1        0.01       99.89
      54595 |          1        0.01       99.90
      55105 |          1        0.01       99.91
      55180 |          3        0.03       99.94
      55240 |          4        0.04       99.98
      55480 |          1        0.01       99.99
      70112 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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