Frequencies for first 10,000 rows of breech variable in natl1990 dataset :

Breech/Malp |
resentation |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        342        3.42        3.42
          2 |      9,592       95.92       99.34
          9 |         66        0.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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