Space, Time, and Hyperspace - Revision 2016 statistics

Scores on Space, Time, and Hyperspace - Revision 2016 as of 17 September 2021

Contents type: Spatial.   Period: 2016-present

• n: 64
• Median: 16.0
• Quartile deviation: 2.8
• Range: 22.5
• Maximum possible: 24
• Male median: 16.0 (n = 62)
• Female median: 13.8 (n = 2)
• Resolution: 0.34 (0.48 if half points are frequently given)

Correlation of Space, Time, and Hyperspace - Revision 2016 with other tests by I.Q. Tests for the High Range

Weighted average of correlations: 0.634 (N = 914, weighted sum = 579.72)

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 4 score pairs. All known pairs are used, including possible floor/ceiling scores or outliers.

Correlation of Space, Time, and Hyperspace - Revision 2016 with tests by others

Weighted average of correlations: 0.193 (N = 37, weighted sum = 7.13)

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 4 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 Space, Time, and Hyperspace - Revision 2016 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.

N = 665

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

Balanced g loading = 0.76

National medians for Space, Time, and Hyperspace - Revision 2016

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 Space, Time, and Hyperspace - Revision 2016

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

• r = -0.07 (n = 63)

Correlation of Space, Time, and Hyperspace - Revision 2016 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.

Reliability

• Split-half (odd-even) = 0.92
• Split-half (other division) = 0.93
• Cronbach's alpha = 0.90

This reliability is high for such a short test (which is only a subtest) and that is a result of the revisions undergone by the test, which have left it with only good items. The price for that is paid in the form of a lower hardness. It is observed more often that a high reliability does not necessarily make for a good test but comes at a price. It is a mistake to strive for high reliability as the only or primary indicator of test quality.

Error

• Standard error = 1.7 raw score points

Scores by age

N = 64

Scores by year taken

r_{year taken × median score} = 0.43 (N = 64)

Robustness and overall test quality

• Robustness by chronological rank = 0.66
• Robustness by month = 0.68 (r_{raw scores × months} = 0.09)
• Quality = 0.700

The robustness of a test that has undergone multiple revisions is protected by restricting the group of candidates to those who have taken a maximum of one (1) of the prior versions. This prevents an inflation of scores, which would cause the norms to become too low for newer candidates.

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.

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