For example, the hypergamy ratio of white women in black male/white female (BM/WF)
unions over the period was 1.252, while the expected ratio was only 0.928, indicating that
white
women are much more likely to marry up than would be expected under a model which assumes
that white women in interracial and intraracial marriages have the same underlying propensity
for educational hypergamy. Similarly, the hypergamy ratio of men in white male/black female
(WM/BF) unions was 1.099, compared to an expected value of 0.776,
indicating significant upward
marriage for white men in these unions.
http://pages.uoregon.edu/aarong/pape...intermared.pdf
http://sociology.uoregon.edu/faculty/gullickson.php
Aaron Gullickson is the leading researcher of interracial marriages today.