Frequencies for first 10,000 rows of uop_tocol variable in natlterr2007 dataset :

  Tocolysis |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        190        1.90        1.90
          2 |      8,488       84.88       86.78
          9 |      1,322       13.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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