Frequencies for first 10,000 rows of pulsoxim variable in nhamcsed1997 dataset :

      pulse |
   oximetry |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,986       79.86       79.86
          1 |      2,014       20.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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