June 14, 2005

Best estimate yet of white-Hispanic IQ gap

I've been doing a lot of research on this subject lately because, frankly, it's shameful and alarming that America's elites are carrying out a vast social experiment by emasculating enforcement of the laws against illegal immigration, yet almost nobody is discussing the facts about what kind of new version of America they are creating. Everyone across the political spectrum admits that the white-black test score gap is a major social problem, but nobody is thinking about the white-Hispanic test score gap. Fortunately, the facts are available, but they take a lot of digging to uncover.

Here's the best estimate I've yet seen: A 2001 meta-analysis of 39 studies covering a total 5,696,519 individuals in America (aged 14 and above) came up with an overall difference of 0.72 standard deviations in g (the "general factor" in cognitive ability) between "Anglo" whites and Hispanics. The 95% confidence range of the studies ran from .60 to .88 standard deviations, so there's not a huge amount of disagreement among the studies.

One standard deviation equals 15 IQ points, so that's a gap of 10.8 IQ points, or an IQ of 89 on the Lynn-Vanhanen scale where white Americans equal 100. That would imply the average Hispanic would fall at the 24th percentile of the white IQ distribution. This inequality gets worse at higher IQs Assuming a normal distribution, 4.8% of whites would fall above 125 IQ versus only 0.9% of Hispanics, which explains why Hispanics are given ethnic preferences in prestige college admissions.

In contrast, 105 studies of 6,246,729 individuals found an overall white-black gap of 1.10 standard deviations. So, the white-Hispanic gap appears to be about 65% as large as the notoriously depressing white-black gap. (Warning: this 65% number does not come from a perfect apples to apples comparison because more studies are used in calculating the white-black difference than the white-Hispanic difference.)

Source: Roth, P. L., Bevier, C. A., Bobko, P., Switzer III, F. S. & Tyler, P. (2001) Ethnic group differences in cognitive ability in employment and educational settings: a meta-analysis. Personnel Psychology 54, 297–330.

My published articles are archived at iSteve.com -- Steve Sailer


Anonymous said...

You're an ignorant racist fool. I just finished reading your "critique" on the "leftist educators" (UCLA's Tellez and Ortiz). Words can't even express my disgust with you.

Anonymous said...

I respect the freedom of speech this country grants. I respect your point of view however According to the U.S Census Hispanics are an ethnicy not a race,there are white, black and native americans or mixed race hispanics. There are German Hispanics, Chinese hispanics, Jewish Hispanics, and Maya Hispanics. By the way this category was invented by one of the best Republican presidents Nixon,famous for destroying the health care system of this nation and cheating thanks to his ethnocentric views we have this confusion. A white Anglo Saxon is the father of the Hispanic race, not the Romans that conquered the iberian penisula Spain in the heart of Europe or The white European Spaniards that settled in latin America, Cervantes was not white European as Shaspeaker according to your ethnocentric and ignorant comments, probably your are like millions of Americans highly deficient in geography. Spain is a white european country like England. Spanish is a european language as English. This cultural wars are futile and useless. Your findings are subjective and lack and antropological point of view. Race is a social construct. The hispanic term has no meaning outside the United States, it is your passport who defines who you are, Mexican, Colombian, Spaniard, Costa Rican, white is an American invention too, in Europe you are German, Spaniard, Italian in Africa you are not just black, you are Nigerian, Somalian that is why your comments have no base