Frequencies for first 10,000 rows of rx4v1c4 variable in nhamcsed2013 dataset :

   For RX4, |
 level 1 of |
MULTUM drug |
category #4 |
     (broad |
     level) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,960       99.60       99.60
        057 |         40        0.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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