Frequencies for first 10,000 rows of bpap variable in nhamcsed2015 dataset :

 BiPAP/CPAP |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,938       99.38       99.38
        Yes |         62        0.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Nov 2017