Social dominance and authoritarianism jointly predict a large share of prejudice variance.

Evidence

I had, with no foresight whatsoever, done an earlier study on the issues now before us by including the SDO scale in a booklet answered anonymously by 501 parents of Manitoba students in the fall of 1995. This booklet also contained the RWA scale and two measures of prejudice, the Manitoba Ethnocentrism scale and Spence and Helmreich’s (1978) Attitudes toward Women scale. Social dominance correlated . and . with these, compared with authoritarianism’s . and .55. SDO and RWA interconnected .28, and together they explained 58% of the variance of the sum of the standardized prejudice scores. — John T. Jost and Jim Sidanius, Political Psychology, 975