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

  Prolonged |
  Labor RFP |
607=f_on_pr |
    olong R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,275       62.75       62.75
          N |      3,709       37.09       99.84
          U |          1        0.01       99.85
          Y |         15        0.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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