Frequencies for first 10,000 rows of uop_tocol variable in natlterr2006 dataset :

  Tocolysis |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        358        3.58        3.58
          2 |      8,142       81.42       85.00
          9 |      1,500       15.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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