Talk:IQ and the Wealth of Nations

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"Finlands statsminister i rasistskandal". Dagens Nyheter. August 10, 2004.

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Wicherts et al on African I.Q.s, Lynn Thesis

http://www.sciencedaily.com/releases/2010/01/100121155220.htm

Controversial Study of African IQ Levels Is 'Deeply Flawed'

ScienceDaily (Jan. 21, 2010) - The controversial study on African IQ levels conducted by psychologist Richard Lynn is deeply flawed. This conclusion is the outcome of studies by Jelte Wicherts, Conor Dolan, Denny Borsboom and Han van der Maas of the University of Amsterdam (UvA) and Jerry Carlson of the University of California (Riverside).

Their findings are set to be published in Intelligence, Personality and Individual Differences, and Learning and Individual Differences.

In an oft-quoted literature study conducted in 2006, Lynn concluded that black Africans have an average IQ of less than 70 (compared to an average western IQ of 100). Lynn suggested that these low IQs are indicative of a low intelligence level, claiming this offered an explanation for the low level of economic development in sub-Saharan countries.

Lynn's study is well known among psychologists, and has been referenced by academics such as Nobel laureate James Watson, and the authors of the controversial book The Bell Curve -- Intelligence and Class Structure in America (Richard Herrnstein and Charles Murray: Freepress, 1994).

African IQ scores prove flawed

Wicherts and his colleagues examined over 100 published studies, concluding that there is no evidence to back up Lynn's claims. Amongst other flaws, Lynn used selective data by systematically ignoring Africans with high IQ scores. The researchers also claim that African IQ test scores cannot be interpreted in terms of lower intelligence levels, as these scores have different psychometric characteristics than western IQ test scores. Until now, the incomparability of Western and African IQ scores had never been systematically proven.

The scientists point out that the average African IQ is currently comparable to the average level in the Netherlands around 1950. However, IQ scores in Western countries have risen sharply over the course of the 20th century. In view of this trend, Wicherts and his colleagues claim there are no reasonable grounds to conclude that sub-Saharan countries are poor due to the lower IQ scores of their populations. As it turns out, the average IQ of African adults is seeing a similar rising trend, which is expected to continue if living conditions in Africa improve in future.

Story Source:

   Adapted from materials provided by Universiteit van

Amsterdam (UVA).

Journal References:

[see below]

Personality and Individual Differences
Volume 48, Issue 2, January 2010, Pages 91-96
doi:10.1016/j.paid.2009.05.028
Copyright c 2009 Elsevier Ltd All rights reserved.

Review

Why national IQs do not support evolutionary theories of intelligence

Jelte M. Wicherts, Denny Borsbooma and Conor V. Dolana

aDepartment of Psychology, University of Amsterdam, Roetersstraat 15, 1018 WB Amsterdam, The Netherlands

Received 16 February 2009; revised 19 May 2009; accepted 26 May 2009. Available online 24 June 2009.

Abstract

Kanazawa (2008), Templer (2008), and Templer and Arikawa (2006) claimed to have found empirical support for evolutionary theories of race differences in intelligence by correlating estimates of national IQ with indicators of reproductive strategies, temperature, and geographic distance from Africa. In this paper we criticize these studies on methodological, climatic, and historical grounds. We show that these studies assume that the Flynn Effect is either nonexistent or invariant with respect to different regions of the world, that there have been no migrations and climatic changes over the course of evolution, and that there have been no trends over the last century in indicators of reproductive strategies (e.g., declines in fertility and infant mortality). In addition, we show that national IQs are strongly confounded with the current developmental status of countries. National IQs correlate with all the variables that have been suggested to have caused the Flynn Effect in the developed world.

Keywords: Evolutionary psychology; Flynn Effect; Race differences

Article Outline

1. Introduction
2. Temporal constancy over the course of evolution?
3. Climate change
4. Changes in reproductive strategies
5. Migration and geographic distance
6. The temporal stability of IQ-scores
7. The many confounds of national IQ
8. Method
9. Results
10. Discussion
Acknowledgements
References

Corresponding author. Tel.: +31 205257067.

Personality and Individual Differences
Volume 48, Issue 2, January 2010, Pages 104-106
doi:10.1016/j.paid.2009.08.020
Copyright c 2009 Elsevier Ltd All rights reserved.

Short Communication

Evolution, brain size, and the national IQ of peoples around 3000 years B.C

Jelte M. Wicherts a, Denny Borsboom a and Conor V. Dolan a

aUniversity of Amsterdam, Department of Psychology, Amsterdam, The Netherlands

Received 22 August 2009; accepted 26 August 2009. Available online 18 September 2009.

Abstract

In this rejoinder, we respond to comments by Lynn, Rushton, and Templer on our previous paper in which we criticized the use of national IQs in studies of evolutionary theories of race differences in intelligence. We reiterate that because of the Flynn Effect and psychometric issues, national IQs cannot be taken to reflect populations' levels of g as fixed since the last ice age. We argue that the socio-cultural achievements of peoples of Mesopotamia and Egypt in 3000 B.C. stand in stark contrast to the current low level of national IQ of peoples of Iraq and Egypt and that these ancient achievements appear to contradict evolutionary accounts of differences in national IQ. We argue that race differences in brain size, even if these were entirely of genetic origin, leave unexplained 91-95% of the black-white IQ gap. We highlight additional problems with hypotheses raised by Rushton and Templer. National IQs cannot be viewed solely in evolutionary terms but should be considered in light of global differences in socio-economic development, the causes of which are unknown.

Keywords: Evolutionary psychology; Flynn Effect; Race differences; Brain size

Article Outline

1. Introduction
2. IQ avant la lettre
3. Brain size
4. The Big picture
5. Conclusion
Acknowledgements
References

Corresponding author. Address: Department of Psychology, University of Amsterdam, Roetersstraat 15, 1018 WB Amsterdam, The Netherlands. Tel.: +31 205257067.

Intelligence
Volume 38, Issue 1, January-February 2010, Pages 1-20
doi:10.1016/j.intell.2009.05.002
Copyright c 2009 Elsevier Inc. All rights reserved.

A systematic literature review of the average IQ of sub-Saharan Africans

Jelte M. Wicherts, Conor V. Dolan a and Han L.J. van der Maas a

a Department of Psychology, Psychological Methods, University of Amsterdam, Roetersstraat 15, 1018 WB Amsterdam, The Netherlands

Received 8 October 2008; revised 6 May 2009; accepted 12 May 2009. Available online 9 June 2009.

Abstract

On the basis of several reviews of the literature, Lynn [Lynn, R., (2006). Race differences in intelligence: An evolutionary analysis. Augusta, GA: Washington Summit Publishers.] and Lynn and Vanhanen [Lynn, R., & Vanhanen, T., (2006). IQ and global inequality. Augusta, GA: Washington Summit Publishers.] concluded that the average IQ of the Black population of sub-Saharan Africa lies below 70. In this paper, the authors systematically review published empirical data on the performance of Africans on the following IQ tests: Draw-A-Man (DAM) test, Kaufman-Assessment Battery for Children (K-ABC), the Wechsler scales (WAIS & WISC), and several other IQ tests (but not the Raven's tests). Inclusion and exclusion criteria are explicitly discussed. Results show that average IQ of Africans on these tests is approximately 82 when compared to UK norms. We provide estimates of the average IQ per country and estimates on the basis of alternative inclusion criteria. Our estimate of average IQ converges with the finding that national IQs of sub-Saharan African countries as predicted from several international studies of student achievement are around 82. It is suggested that this estimate should be considered in light of the Flynn Effect. It is concluded that more psychometric studies are needed to address the issue of measurement bias of western IQ tests for Africans.

Keywords: Group differences; Black-White differences; Flynn Effect; Race differences; Cross-cultural comparison; National IQ

Article Outline

1. Scholastic achievement surveys
2. A systematic review of the literature
3. Method
3.1. Search of studies
3.2. Our inclusion criteria
3.2.1. Norms
3.2.2. Standardized test administration of entire IQ test
3.2.3. No reported problems during testing
3.2.4. No measurement bias
3.2.5. Normal samples
3.3. Statistical analyses
4. Results
4.1. Draw-a-Man test
4.2. Kaufman-Assessment Battery for Children
4.3. Wechsler Scales
4.4. Culture Fair Intelligence Test
4.5. Other IQ tests
4.6. Meta-analytic analyses
4.7. Publication bias
5. Conclusion
Appendix A. Appendix
References

Corresponding author. Tel.: +31 205257067; fax: +31 206390026.

Intelligence
Volume 38, Issue 1, January-February 2010, Pages 30-37
doi:10.1016/j.intell.2009.11.003
Copyright c 2009 Elsevier Inc. All rights reserved.

The dangers of unsystematic selection methods and the representativeness of 46 samples of African test-takers

Jelte M. Wicherts, Conor V. Dolan a and Han L.J. van der Maas a

a University of Amsterdam, The Netherlands Received 13 October 2009; accepted 6 November 2009. Available online 3 December 2009.

Abstract

In this rejoinder, we criticize Lynn and Meisenberg's (this issue) methods to estimate the average IQ (in terms of British norms after correction of the Flynn Effect) of the Black population of sub-Saharan Africa. We argue that their review of the literature is unsystematic, as it involves the inconsistent use of rules to determine the representativeness and hence selection of samples. Employing independent raters, we determined of each sample whether it was (1) considered representative by the original authors, (2) drawn randomly, (3) based on an explicated stratification scheme, (4) composed of healthy test-takers, and (5) considered by the original authors as normal in terms of Socio-Economic Status (SES). We show that the use of these alternative inclusion criteria would not have affected our results. We found that Lynn and Meisenberg's assessment of the samples' representativeness is not associated with any of the objective sampling characteristics, but rather with the average IQ in the sample. This suggests that Lynn and Meisenberg excluded samples of Africans who average IQs above 75 because they deemed these samples unrepresentative on the basis of the samples' relatively high IQs. We conclude that Lynn and Meisenberg's unsystematic methods are questionable and their results untrustworthy.

Keywords: Systematic literature review; National IQ; Group differences in IQ

Article Outline

1. Introduction
2. The full database
3. Inconsistent rules to determine representativeness
4. What is representative?
5. Conclusion
Acknowledgements
Appendix A. Supplementary data
References

Corresponding author. Department of Psychology, Psychological Methods, University of Amsterdam, Roetersstraat 15, 1018 WB Amsterdam, The Netherlands. Tel.: +31 205257067; fax: +31 206390026.

Learning and Individual Differences
Article in Press, Corrected Proof - Note to users
doi:10.1016/j.lindif.2009.12.001
Copyright c 2009 Elsevier Inc. All rights reserved.

Raven's test performance of sub-Saharan Africans: Average5 performance, psychometric properties, and the Flynn Effect

Jelte M. Wicherts a, Conor V. Dolan a, Jerry S. Carlson b and Han L.J. van der Maas a

a Department of Psychology, Psychological Methods, University of Amsterdam, Roetersstraat 15, 1018 WB Amsterdam, The Netherlands

b University of California, Riverside, United States

Received 19 May 2009; revised 19 November 2009; accepted 3 December 2009. Available online 16 December 2009.

Abstract

This paper presents a systematic review of published data on the performance of sub-Saharan Africans on Raven's Progressive Matrices. The specific goals were to estimate the average level of performance, to study the Flynn Effect in African samples, and to examine the psychometric meaning of Raven's test scores as measures of general intelligence. Convergent validity of the Raven's tests is found to be relatively poor, although reliability and predictive validity are comparable to western samples. Factor analyses indicate that the Raven's tests are relatively weak indicators of general intelligence among Africans, and often measure additional factors, besides general intelligence. The degree to which Raven's scores of Africans reflect levels of general intelligence is unknown. Average IQ of Africans is approximately 80 when compared to US norms. Raven's scores among African adults have shown secular increases over the years. It is concluded that the Flynn Effect has yet to take hold in sub-Saharan Africa.

Keywords: Black-White differences; Cognitive abilities; Cross-cultural comparison; Measurement equivalence; Measurement invariance

Article Outline

1. Introduction
2. Is average IQ of Africans really below 70?
2.1. Method
2.1.1. Selection bias
2.1.2. Search of studies
2.1.3. Exclusion criteria
2.1.4. Converting raw scores to IQ
2.2. Results
2.2.1. Raven's Standard Progressive Matrices
2.2.2. Coloured Progressive Matrices
2.3. Conclusion on the average IQ of Africans
3. The Flynn Effect
3.1. Flynn Effect in Africa
4. Measurement problems and psychometric comparability
4.1. Reliability
4.2. Convergent validity
4.3. Factor analytical results
4.4. Measurement invariance
4.5. Criterion validity in educational settings
4.6. Conclusion on psychometric properties
5. General discussion
Acknowledgements
Appendix A. Appendix

Converting raw scores to IQs

Appendix B. Appendix References

Corresponding author. Tel.: + 31 205257067; fax: + 31 206390026.

IQ and GDP per capita graph

This graph is patiently WP:SYNTH; it combines two separate data sources (IQ by country from worlddata.info, and GDP per capita from the IMF) in a way that leads the reader to a conclusion, outright describing the combination as just the synthesis made by a single editor. We cannot use that sort of thing in articles. EDIT: Also, I'm not sure that worlddata.info passes WP:RS; it appears to just be someone's personal website. Reading their description on here for the IQ data, though, they're using the list of estimated IQs from the book, which we're not allowed to reproduce here - I don't think putting it in graph form (synthesized with GDP) gets around the copyright issue. --Aquillion (talk) 03:41, 10 November 2019 (UTC)[reply]

Croatia

Pick another card, because this one is absolute rubbish!

Richard Lynn and Tatu Vanhanen used IQ tests of children aged between 13 and 16 years old from 1952. Very reputable both of them. Later they had to correct their data. Unfortunately, this information has already been spread by equally dubious authors in several books, for whatever reason. Now is the Average iq for Croatia 99.

https://www.researchgate.net/publication/229401257_National_IQs_calculated_and_validated_for_108_nations

Many of the most intelligent people in the world come from Croatia and you should accept that!

Three Croatians on the list of the smartest people alive today.

https://www.croatiaweek.com/3-croatians-make-30-smartest-people-alive-today-list/

The World Genius Directory Geniuses http://psiq.org/home.html

At least 7 Croats are among the 200 most intelligent people in the world. IQ Score: 192, 183, 180, 174, 163, 160, 151

Approximately 7 from Germany - 182 He is Turk not even a German, 165, 158, 156, 156, 153, 147

Approximatly 5 from France - 162, 158, 154, 150, 141

Approximatly 7 from the United Kingdom - 171, 167, 163, 153, 148, 144, 135

Approximatly 38 from Japan

Approximatly 30 from China

Approximatly 14 from Korea

Approximatly 21 from Italy

Four Croats have a higher IQ than the highest IQ-Score for Germany (182 is a Turk) and the United Kingdom and even five Croats have a higher IQ than the highest IQ-Score for France. — Preceding unsigned comment added by 212.25.6.141 (talk) 12:45, 19 May 2020 (UTC)[reply]

"List of nations by IQ" should not redirect here

The contents of this page are not nearly extensive enough to suffice for this redirect. Adding a list of countries by IQ would clutter this page, so removing the redirect is justified. Oro Temp (talk) 17:16, 4 November 2023 (UTC)[reply]

Single citation for "National IQ estimates"

Hello, it seems that there is a large chunk of information in this section that makes very specific claims about the data with no citations to support this. For instance, there is a clam that 104 nations have no data at all, while the paper explicitly states that "measures of final IQ's are available for 160 countries and territories." If there is no source for this information and the first claim is false, a fine tooth comb should be taken to this section to determine the truth. Hawgbak (talk) 03:35, 16 December 2024 (UTC)[reply]

T$3 claim appears to have been simply erased over time, but through edits I have traced it back to a research paper by Thomas Volken:

https://www.researchgate.net/publication/281714053_Original_Working_Paper_on_IQ_Wealth_of_Nations

However, he does not immediately substantiate his claims either, and this source must be further investigated. Hawgbak (talk) 03:54, 16 December 2024 (UTC)[reply]