Frequencies for first 10,000 rows of pulsoxim variable in nhamcsed1999 dataset :

      pulse |
   oximetry |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,007       80.07       80.07
          1 |      1,993       19.93      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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