Frequencies for first 10,000 rows of on_prol variable in natlterr2012 dataset :

  Prolonged |
  Labor RFP |
607=f_on_pr |
    olong R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,163       11.63       11.63
          N |      8,377       83.77       95.40
          U |        402        4.02       99.42
          Y |         58        0.58      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 5 May 2016