Frequencies for first 10,000 rows of induct variable in natl1993 dataset :

  Induction |
   of labor |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        779        7.79        7.79
          2 |      9,191       91.91       99.70
          9 |         30        0.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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