Statistics for the Verbal section of the Test For Genius - Revision 2004

Scores on Verbal section of Test For Genius - Revision 2004 as of 26 August 2019

Contents type: Verbal.   Period: 2004-present

• n: 115
• Median: 14.0
• Quartile deviation: 5.0
• Range: 36
• Maximum possible: 48
• Male median: 13.8 (n = 110)
• Female median: 10.0 (n = 4)
• Resolution: 0.46

Correlation of Verbal section of Test For Genius - Revision 2004 with other tests by Paul Cooijmans

Weighted average of correlations: 0.612 (weighted sum: 765.53)

Conservatively estimated minimum g loading: 0.78

Ranking in above table is based on the unrounded correlations. All available data is present in this table, no tests are left out except for those with less than 3 score pairs. All known pairs are used, including possible floor/ceiling scores or outliers.

Correlation of Verbal section of Test For Genius - Revision 2004 with tests by others

Weighted average of correlations: 0.422 (weighted sum: 111.29)

Ranking in above table is based on the unrounded correlations. All available data is present in this table, no tests are left out except for those with less than 3 score pairs. All known pairs are used, including possible floor/ceiling scores or outliers.

Please be aware that correlations with these external tests are in most cases affected (depressed, typically) by one or more of the following: (1) Little overlap with the object test because of the much lower ceilings and inherent ceiling effects of the tests used in regular psychology; (2) Candidates reporting scores selectively, for instance only the higher ones while withholding lower ones; (3) Candidates reporting, or having been reported by psychometricians, incorrect scores.

Correlation of Verbal section of Test For Genius - Revision 2004 with other tests by Paul Cooijmans - for females

Weighted average of correlations: 1.000

Conservatively estimated minimum g loading among females: 1.00

Ranking in above table is based on the unrounded correlations. All available data is present in this table, no tests are left out except for those with less than 1 score pairs. All known pairs are used, including possible floor/ceiling scores or outliers.

Estimated loadings of Verbal section of Test For Genius - Revision 2004 on particular item types

These are estimated g factor loadings, but against homogeneous tests (containing only particular item types) as opposed to non-compound heterogeneous tests. Although tending to surprise the lay person, it is not uncommon for tests to have high loadings on item types they do not actually contain themselves. Such loadings reflect the empirical fact that most tests for mental abilities measure primarily g, regardless of their contents; that the major part of test score variance is caused by g, and only a minor part by factors germane to particular item types. It is of key importance to understand that this is a fact of nature, a natural phenomenon, and not something that was built into the tests by the test constructors.

Compound tests have been left out of this table to avoid overlap.

Balanced g loading = 0.72

National medians for Verbal section of Test For Genius - Revision 2004

For reasons of privacy, only countries with 2 or more candidates are included in this table. Ranking is based on the medians, and then alphabetic.

Correlation with national I.Q.'s of Verbal section of Test For Genius - Revision 2004

Correlation of this test with national average I.Q.'s published by Lynn and Vanhanen:

• r = 0.15 (n = 114)

Correlation of Verbal section of Test For Genius - Revision 2004 with personal details

Estimated g factor loadings upward and downward of particular scores

In parentheses the number of score pairs on which that estimated g factor loading is based. The goal of this is to verify the hypothesis that g becomes less important, accounts for a smaller proportion of the variance, at higher I.Q. levels. The mere fact of restricting the range like this also depresses the g loading compared to computing it over the test's full range, so it would be normal for both values to be lower than the test's full-range g loading.

Remark on the internal statistics below

The internal statistics of this test, shown below, are of February 2023, so more recent than the above. Notice that this is a subtest of both the Revision 2004 and Revision 1010 of the Test For Genius.

Reliability

• Split-half (odd-even) = 0.89
• Split-half (1, 2… 5, 6… vs. 3, 4… 7, 8…) = 0.89
• Cronbach's alpha = 0.88

Error

• Standard error = 2.5 raw score points

Scores by age

N = 116

Scores by year taken

r_{year taken × median score} = 0.46 (N = 117)

Robustness and overall test quality

• Robustness by month = 0.68 (r_{raw scores × months} = 0.07)
• Quality = 0.775

Item analysis

Item statistics are not published as that would help candidates. To detect bad items, answers and comments from candidates are studied, as well as, for each problem, the correlation with total score on the remaining problems (item-rest correlation) and the proportion of candidates getting it wrong (hardness of the item). Possible bad items are revised, replaced, or removed, possibly resulting in a revised version of the test.