HVGIQ: Thailand

Thailand has a population of over 64 million people, which is comparable to the United Kingdom or France. It is the world’s 21st most populous country.

IQ and the Wealth of Nations (2002) and IQ and Global Inequality (2006) both assign Thailand an IQ of 91 based on one clinical trial from 1989. Lynn and Vanhanen (2012, p. 417) add two more studies that push their estimate down to 88. Some of their numbers are reported inaccurately and these books overlook larger, higher quality, and more recent intelligence test studies for this nation. In particular—as I noted on Gene Expression almost a decade ago—the government of Thailand has implemented broad national IQ surveys, which have been reported in relation to U.S. and U.K. test norms.

In this post I review almost 50 studies of intelligence and scholastic achievement for the nation of Thailand. Many representative studies since the 1990s give conflicting results, making a solid estimate of Thailand’s IQ a difficult task.
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HVGIQ: Guadeloupe

Guadeloupe is one of the 27 administrative regions of France. ‘Regions’ are the French version of states, so Guadeloupe is a part of France in much the same way that Hawaii is part of the U.S. The region consists of five islands with about 400,000 people, and its three largest racial groups are black (71%), Asian Indian (15%), and white (9%).

Guadeloupe is one of the poorest regions of France, but like many other Caribbean territories, it has a strong tourism economy and a relatively high standard of living: if it were a country it would rank about 37th in GDP per capita—slightly ahead of the Czech Republic.

This short post summarizes one small study with some intelligence test data for Guadeloupe.
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U.S. Ethnic/Race Differences in Aptitude by Generation: An Exploratory Meta-analysis


We conducted an exploratory meta-analysis using 18 samples for which we were able to decompose scores by sociological race and immigrant generation. For Blacks and Whites of the same generation, the first, second, and third+ generation B/W d-values were 0.79, 0.75, and 0.97. For Hispanics and NH Whites of the same generation, the first, second, and third+ generation H/W d-values were 0.82, 0.64, and 0.55. For Asians and Whites of the same generation, the first, second, and third+ generation d-values were -0.11, -0.25, and -0.21. Relative to third generation Whites, the average d-values were  0.96, 0.79, and 0.97 for first, second, and third+ generation Black individuals, 1.0, 0.68, and 0.55 for first, second, and third+ generation Hispanic individuals, and 0.03, -0.25, and -0.21 for first, second, and third+ generation Asian individuals.

Keywords: Immigrants, group differences, race, ethnicity, aptitude

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HVGIQ: Vietnam

Richard Lynn and Tatu Vanhanen did not have a study for Vietnam in IQ and the Wealth of Nations (2002). Then, beginning with their follow-up book, IQ and Global Inequality (2006), Lynn added a bogus study for Vietnam and gave the world’s 13th most populous country a made-up national IQ of 94. In short, Lynn’s dataset does not have an IQ study for Vietnam.

In this post I review two dozen intelligence and achievement test studies for Vietnam and Vietnamese populations living internationally. While IQ in Vietnam is lower than I anticipated, there is evidence that Vietnamese people have high intellectual potential.

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HVGIQ: Turks and Caicos Islands

The Turks and Caicos Islands is classified as a British Overseas Territory (other examples are Bermuda and the Cayman Islands). It has a population of 32,000, and its demographics are 88% black and 8% white. Like many small Caribbean territories, the Turks and Caicos Islands enjoy a high standard of living fueled by finance and tourism.

Lynn & Vanhanen do not have a study for this territory and, with the exception of Bermuda, they don’t include British Overseas Territories in their full dataset of estimated scores.

In this short post I summarize one study for the Turks and Caicos Islands.
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HVGIQ: Cambodia

Much like Burma, Cambodia is a populous Southeast Asian country with a toxic authoritarian government, and routinely shows up at the back of human development indices. Richard Lynn’s international IQ dataset likewise does not yet have a study for this country.

Lynn & Vanhanen (2002, p. 74) make an IQ estimate of 89 for Cambodia by averaging together scores from its regional neighbors Thailand (91) and the Philippines (86). IQ and Global Inequality (2006, p. 56) revises this estimate to 91 by averaging together scores from three neighbors: Laos (89), Thailand (91), and Vietnam (94). Lynn & Vanhanen’s most recent update (2012, p. 21) assigns Cambodia an IQ of 92, but it’s not entirely clear why, as this book no longer lists the nations used to generate regional estimates. Presumably it’s the rounded average of Laos (89) and Vietnam (94).

In this post I present several different intelligence studies from Cambodia, as well some data for U.S. immigrants. These studies suggest that Cambodia has one of the lowest IQs in the world, but their achievement test scores in the U.S. exceed blacks and Hispanics.
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The Fallacy of Significance Tests

It must be known that a p-value, or any other statistics based on the Chi-Square, is not a useful number. It has two components : sample size and effect size. Its ability to detect a non-zero difference increases when either sample size or effect size increases. If only sample size increases, even with the other left constant, the statistics become inflated. There is also a problem with the assumption. If it is about the detection of “non-zero” difference, it is of no use if the magnitude, i.e., effect size, is of no importance. I will provide several examples of the dangerosity of the significance tests.
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