Frequencies for first 10,000 rows of uld_breech variable in natl2007 dataset :

 Breech RFP |
721=f_uld_b |
  reech U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        226        2.26        2.26
          2 |      9,128       91.28       93.54
          9 |        646        6.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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