Frequencies for first 10,000 rows of f_uob_tocol variable in natlterr2009 dataset :

Tocolysis U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,349       13.49       13.49
          1 |      8,651       86.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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