Researchers competitively tested 22 personality measures against each other

Evidence

Enter Sam McFarland and Sherman Adelson, who employed 438 Kentucky students and 283 nonstudent adults in a grand pitting experiment featuring 22 different psychological measures. Three of these assessed prejudice against Blacks, women, and homosexuals, and a fourth scale tapped patriotic attitudes. Abbreviated versions of 18 personality tests that had shown some connection with prejudice, including the RWA and SDO scales, composed the rest of the longish booklet. The researchers wanted to see how much of the “target” prejudice/patriotism scores could be explained by these personality tests. — John T. Jost and Jim Sidanius, Political Psychology, 935