Not done Sir, but doing.

Plenty is doing.

"....the average correlation between indices of K [in Canadian psychology students] was only +.09 even after correcting for attenuation.... We would argue that the [reason] lies in the restriction of range occurring in the sample."

A.F.BOGAERT & J.P.RUSHTON, 1989, Personality & Individual Differences 10.

Disclaimer: this quote appears here only to spark discussion. It is not endorsed one way or the other. Make up your own mind. Or just refresh the page for another viewpoint. From a collection assembled by the late Chris Brand.