Frequencies for first 10,000 rows of blodpres variable in nhamcsopd2006 dataset :

      blood |
   pressure |
      taken |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      3,792       37.92       37.92
        Yes |      6,208       62.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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