Frequencies for first 10,000 rows of drg4ing3 variable in nhamcsed2000 dataset :

 ingredient |
code #3 for |
    drug #4 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,985       99.85       99.85
      51130 |          1        0.01       99.86
      52990 |          1        0.01       99.87
      53175 |          2        0.02       99.89
      54395 |          6        0.06       99.95
      55240 |          4        0.04       99.99
      55755 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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