Frequencies for first 10,000 rows of f_ob_toco variable in natlterr2011 dataset :

  Tocolysis |
 (op_tocol) |
          R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,591       55.91       55.91
          1 |      4,409       44.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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