Frequencies for first 10,000 rows of rx4v1c4 variable in nhamcsed2012 dataset :

   For RX4, |
 level 1 of |
MULTUM drug |
category #4 |
     (broad |
     level) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,978       99.78       99.78
        040 |          1        0.01       99.79
        057 |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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