Frequencies for first 10,000 rows of rx4v1c3 variable in nhamcsed2012 dataset :

   For RX4, |
 level 1 of |
MULTUM drug |
category #3 |
     (broad |
     level) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,945       99.45       99.45
        040 |          9        0.09       99.54
        057 |         45        0.45       99.99
        331 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016