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

      Fetal |
Presentatio |
n (me_pres) |
          R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,590       55.90       55.90
          1 |      4,410       44.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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