Frequencies for first 10,000 rows of uop_tocol variable in natlterr2013 dataset :

  Tocolysis |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         87        0.87        0.87
          2 |      8,415       84.15       85.02
          9 |      1,498       14.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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