Frequencies for first 10,000 rows of breech variable in natl1991 dataset :

Breech/Malp |
resentation |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        313        3.13        3.13
          2 |      9,657       96.57       99.70
          9 |         30        0.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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