Frequencies for first 10,000 rows of rx7v1c4 variable in nhamcsed2011 dataset :

   For RX7, |
 level 1 of |
MULTUM drug |
category #4 |
     (broad |
     level) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,996       99.96       99.96
        057 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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