Frequencies for first 10,000 rows of uop_tocol variable in natlterr2011 dataset :

  Tocolysis |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        207        2.07        2.07
          2 |      7,383       73.83       75.90
          9 |      2,410       24.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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