Frequencies for first 10,000 rows of fetal variable in namcs2013 dataset :

      Fetal |
 monitoring |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,926       99.26       99.26
        Yes |         74        0.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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