Thursday, October 01, 2009

The Extraversion Gap: In an earlier post, I used a behavioral measure to show that Jewish Americans are, on average, more extraverted than Americans of English descent. The finding is reinforced by my other GSS measure of extraversion based on two questions asking if you are: 1) sociable and 2) not reserved. The means are:

Mean extraversion score

English 6.44 (n = 122)
Jewish 7.35 (n = 26)

Since the Jewish sample is so small, the difference falls just short of statistical significance at the .05 level. The effect size is .54 which indicates a half standard deviation gap between the two groups.

Black-white differences in glaucoma

Glaucoma is a progressive condition caused by a combination of genetic and environmental factors and is the leading cause of irreversible bl...