Frequencies for first 10,000 rows of rx2v1c3 variable in nhamcsed2009 dataset :

   for rx2, |
 level 1 of |
multum drug |
category #3 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,829       98.29       98.29
        040 |          2        0.02       98.31
        057 |        167        1.67       99.98
        113 |          1        0.01       99.99
        331 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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