Frequencies for first 10,000 rows of blodpres variable in namcs2005 dataset :

      blood |
   pressure |
      taken |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,437       34.37       34.37
          1 |      6,563       65.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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