The point-biserial correlation is just a special case of the ordinary Pearson r. The reason textbooks show (or used to show) a different formula is that when one variable is a dichotomy, the usual formula could be simplified somewhat.
Michael Score wrote
I am looking to find an application within SPSS 19 to find a Biserial
Correlation Coefficient. I have one variable that is a "rate" and one that
is a "binary (yes/no)" answer.
Does SPSS 19 have this within it?
Thanks.
--
Bruce Weaver
bweaver@lakeheadu.ca
http://sites.google.com/a/lakeheadu.ca/bweaver/"When all else fails, RTFM."
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