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

  Pregnancy |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,167       91.67       91.67
        Yes |        833        8.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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