Frequencies for first 10,000 rows of bpap variable in nhamcsed2013 dataset :

  BPAP/CPAP |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,979       99.79       99.79
        Yes |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016