Frequencies for first 10,000 rows of pregtest variable in namcs2014 dataset :

  Pregnancy |
   test/HCG |
       test |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,962       99.62       99.62
        Yes |         38        0.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017