Frequencies for first 10,000 rows of monitor variable in natlterr1997 dataset :

 Electronic |
      fetal |
 monitoring |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,906       79.06       79.06
          2 |      2,094       20.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015