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

Tocolysis U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      2,295       22.95       22.95
          1 |      7,705       77.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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