Frequencies for first 10,000 rows of uop_induc variable in natl2008 dataset :

  Induction |
   of labor |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,916       29.16       29.16
          2 |      7,077       70.77       99.93
          9 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 May 2016