Frequencies for first 10,000 rows of pregtest variable in nhamcsed2014 dataset :

  Pregnancy |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,390       93.90       93.90
        Yes |        610        6.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017