Frequencies for first 10,000 rows of on_ruptr variable in natlterr2008 dataset :

  Premature |
 Rupture of |
   Membrane |
        RFP |
605=f_on_ru |
    pture R |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      6,061       60.61       60.61
          N |      3,887       38.87       99.48
          Y |         52        0.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 May 2016