Frequencies for first 10,000 rows of mar_p variable in natl2013 dataset :

  Paternity |
Acknowledge |
    d 653 R |      Freq.     Percent        Cum.
------------+-----------------------------------
          N |        710        7.10        7.10
          U |        103        1.03        8.13
          X |      6,542       65.42       73.55
          Y |      2,645       26.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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