Frequencies for first 10,000 rows of uld_breech variable in natlterr2010 dataset :

 Breech RFP |
721=f_uld_b |
  reech U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        214        2.14        2.14
          2 |      7,483       74.83       76.97
          9 |      2,303       23.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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