Frequencies for first 10,000 rows of fetal variable in namcs2015 dataset :

      Fetal |
 monitoring |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,958       99.58       99.58
          1 |         42        0.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 25 Oct 2017