Frequencies for first 10,000 rows of uld_breech variable in natl2010 dataset :

 Breech RFP |
721=f_uld_b |
  reech U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        269        2.69        2.69
          2 |      8,614       86.14       88.83
          9 |      1,117       11.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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