Frequencies for first 10,000 rows of uld_breech variable in natlterr2003 dataset :

 Breech U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        262        2.62        2.62
          2 |      9,712       97.12       99.74
          8 |         23        0.23       99.97
          9 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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