Frequencies for first 10,000 rows of uop_tocol variable in natlterr2005 dataset :

  Tocolysis |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        363        3.63        3.63
          2 |      7,854       78.54       82.17
          9 |      1,783       17.83      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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