Frequencies for first 10,000 rows of blodpres variable in namcs1995 dataset :

      blood |
   pressure |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,629       36.29       36.29
          1 |      6,371       63.71      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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