Statistics of Gliaweb Riddled Intelligence Test - Revision 2011

Norms

Scores on Gliaweb Riddled Intelligence Test - Revision 2011

Contents type: Verbal, numerical, spatial, logical.   Period: 2011-present

• n: 120
• Median: 33.0
• Quartile deviation: 3.0
• Range: 30
• Maximum possible: 42
• Male median: 33.0 (n = 110)
• Female median: 32.0 (n = 10)
• Hardness: 0.21
• Resolution: 0.35

Scores by males

n = 110

Scores by females

n = 10

Correlation of Gliaweb Riddled Intelligence Test - Revision 2011 with other tests by Paul Cooijmans

Weighted average of correlations: 0.637

Conservatively estimated minimum g loading: 0.80

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 Gliaweb Riddled Intelligence Test - Revision 2011 with tests by others

Weighted average of correlations: 0.395

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.

Estimated loadings of Gliaweb Riddled Intelligence Test - Revision 2011 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 = 0.76

National medians for Gliaweb Riddled Intelligence Test - Revision 2011

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 Gliaweb Riddled Intelligence Test - Revision 2011

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

• r = 0.22 (n = 118)

Correlation of Gliaweb Riddled Intelligence Test - Revision 2011 with personal details

Remarkable is that Candidate's self-estimated I.Q. has no significant relation with scores on this test. Disorders have a significant negative correlation as usual, in this case entirely due to the male candidates as can be seen in the within-sex tables below.

Correlation with personal details of Gliaweb Riddled Intelligence Test - Revision 2011 - within females

Correlation with personal details of Gliaweb Riddled Intelligence Test - Revision 2011 - within males

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.

Reliability

• Split-half (odd-even) = 0.83
• Split-half (other division) = 0.87
• Cronbach's alpha = 0.86

Reliability is somewhat lower than desirable (.9 is striven for), likely because most of the items are easy and infrequently missed, there only being a small number of hard problems in the test. But that is how the test was intended to be.

Error

• Standard error = 2.0 raw score points

Scores by age

Scores by age - within females

Scores by age - within males

Scores by year taken

r_{year taken × median score} = 0.05 (n = 120)

Robustness and overall test quality

• Robustness by chronological rank = 0.65
• Robustness by month = 0.66
• Quality = 0.65

Item analysis

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

[Statistics of earlier version of the Gliaweb Riddled Intelligence Test]