Frequencies for first 10,000 rows of uop_tocol variable in natlterr2003 dataset :

  Tocolysis |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        358        3.58        3.58
          2 |      9,619       96.19       99.77
          8 |         23        0.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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