Frequencies for first 10,000 rows of uld_prolg variable in natlterr2006 dataset :

  Prolonged |
  Labor RFP |
719=f_uld_p |
     rolg U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         14        0.14        0.14
          2 |      4,720       47.20       47.34
          9 |      1,541       15.41       62.75
          . |      3,725       37.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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