Qoymans Multiple-Choice #2 statistics

Norms

Scores (test can no longer be taken)

# testees: 256
Mean: 16.08
SD: 8.74
Male mean: 17.05
Female mean: 13.29 (66 persons)

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Correlation with other tests

Weighted average of correlations: 0.379

Estimated minimum g loading: 0.62

Additional statistics November 2014

Scores on Qoymans Multiple-Choice #2

Contents type: Verbal.   Period: 2002-2002

• n: 413
• Median: 15.0
• Quartile deviation: 5.5
• Range: 52
• Maximum possible: 50
• Minimum possible: -50
• Male median: 17.0 (n = 234)
• Female median: 13.0 (n = 120)
• Hardness: 0.35
• Resolution: 0.48

Scores by males

n = 234

Scores by females

n = 120

Correlation of Qoymans Multiple-Choice #2 with other tests by Paul Cooijmans

Weighted average of correlations: 0.314

Conservatively estimated minimum g loading: 0.56

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 2 score pairs. All known pairs are used to obtain the true, honest statistics; correlations have not been artificially inflated by leaving out ceiling scores, outliers or other anomalies.

Note: That so relatively little scores on other tests are known of these candidates is likely because this test could be taken for free and appeared easy, being multiple-choice. This has attracted a large number of candidates within a brief period, but with very little usable data being reported.

Correlation of Qoymans Multiple-Choice #2 with tests by others

Weighted average of correlations: 0.336

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 2 score pairs. All known pairs are used to obtain the true, honest statistics; correlations have not been artificially inflated by leaving out ceiling scores, outliers or other anomalies.

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 Qoymans Multiple-Choice #2 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 2 score pairs. All known pairs are used to obtain the true, honest statistics; correlations have not been artificially inflated by leaving out ceiling scores, outliers or other anomalies.

Estimated loadings of Qoymans Multiple-Choice #2 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 = 0.55

National medians for Qoymans Multiple-Choice #2

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.

Note: For most candidates, country of origin is unknown.

Correlation with national I.Q.'s of Qoymans Multiple-Choice #2

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

• r = -0.10 (n = 30)

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.

Scores by age

Note: Most candidates have not reported their age when taking this test.

Scores by age - within females

Scores by age - within males

Scores by year taken

Reliability, robustness and overall test quality

Reliability can not be computed as the internal statistics (item scores) have not been collected for this test. Robustness can not be computed as the chronological ranks of the test submissions have not been retained.

• Quality = 0.44