Frequencies for first 10,000 rows of blodpres variable in nhamcsopd2011 dataset :

      Blood |
   pressure |
      taken |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      4,361       43.61       43.61
        Yes |      5,639       56.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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