Frequencies for first 10,000 rows of uld_breech variable in natlterr2005 dataset :

 Breech U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        239        2.39        2.39
          2 |      7,910       79.10       81.49
          9 |      1,851       18.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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