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

Stimulation |
 of labor U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,841       18.41       18.41
          2 |      8,136       81.36       99.77
          8 |         23        0.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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