Statistics of Test of the Beheaded Man

© November 2016 Paul Cooijmans


Scores on Test of the Beheaded Man

Contents type: Verbal, numerical, spatial, logical.   Period: 2006-present

1 **
6 **
7 *
8 *
9 *
12 *
16 *
18 *
21 *
22 **
23 ****
24 *
25 *
27 *
28 *****
30 ***
32 *
33 *

Correlation of Test of the Beheaded Man with other tests by Paul Cooijmans

(Test index) Test name n r
(42) The Marathon Test70.98
(32) Spatial section of The Marathon Test80.97
(45) Numerical and spatial sections of The Marathon Test70.97
(21) Psychometric Qrosswords60.97
(31) Numerical section of The Marathon Test80.95
(48) Narcissus' last stand70.94
(30) Verbal section of The Marathon Test70.93
(44) Associative LIMIT100.92
(103) Problems In Gentle Slopes of the second degree50.92
(54) Test of Shock and Awe50.92
(43) Test For Genius - Revision 201050.92
(39) Combined Numerical and Spatial sections of Test For Genius - Revision 201060.91
(1) Cartoons of Shock130.91
(36) Reflections In Peroxide70.89
(19) Numerical section of Test For Genius - Revision 201070.89
(80) Qoymans Multiple-Choice #4100.86
(16) Lieshout International Mesospheric Intelligence Test140.85
(40) Reason Behind Multiple-Choice - Revision 2008140.85
(35) Intelligence Quantifier by assessment110.85
(55) Spatial Insight Test50.84
(28) The Test To End All Tests100.82
(23) Gliaweb Riddled Intelligence Test - Revision 201150.82
(7) The Final Test110.81
(24) Reason - Revision 2008140.80
(2) Cooijmans Intelligence Test - Form 3130.78
(18) The Nemesis Test110.78
(25) The Sargasso Test120.78
(106) Cooijmans Intelligence Test - Form 470.77
(3) Qoymans Multiple-Choice #5140.77
(26) Verbal section of Test For Genius - Revision 2004160.75
(66) Test For Genius - Revision 2004110.74
(4) A Paranoiac's Torture: Intelligence Test Utilizing Diabolic Exactitude70.72
(62) Reason Behind Multiple-Choice70.70
(33) Problems In Gentle Slopes of the first degree50.69
(11) Isis Test80.64
(27) Spatial section of Test For Genius - Revision 2004160.64
(12) Cooijmans On-Line Test - Two-barrelled version70.62
(87) Cooijmans Intelligence Test - Form 260.58
(47) Psychometrically Activated Grids Acerbate Neuroticism50.58
(10) Genius Association Test100.58
(82) Reason80.54
(5) Daedalus Test80.27

Weighted average of correlations: 0.791

Conservatively estimated minimum g loading: 0.89

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

Correlation of Test of the Beheaded Man with tests by others

(Test index) Test name n r
(234) Strict Logic Sequences Exam I60.91
(225) Logima Strictica 3660.80
(242) Unknown and miscellaneous tests120.37

Weighted average of correlations: 0.610

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 5 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 Test of the Beheaded Man 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.

Typeg loading of Test of the Beheaded Man on that type

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

Balanced g loading = 0.88

National medians for Test of the Beheaded Man

Country n median score

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 Test of the Beheaded Man

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

Correlation of Test of the Beheaded Man with personal details

Personalia n r
Candidate's self-estimated I.Q.50.67
Cooijmans Inventory of Neo-Marxist Attitudes80.62
Educational level270.62
Observed associative horizon40.52
P.S.I.A. Rational100.23
P.S.I.A. Neurotic100.22
P.S.I.A. Antisocial100.19
P.S.I.A. Cruel100.16
P.S.I.A. Orderly100.07
P.S.I.A. Rare100.04
P.S.I.A. True10-0.04
P.S.I.A. Ethics factor11-0.11
P.S.I.A. Cold10-0.14
P.S.I.A. System factor6-0.18
Father's educational level26-0.20
Gifted Adult's Inventory of Aspergerisms7-0.22
P.S.I.A. Aspergoid10-0.25
Year of birth30-0.29
P.S.I.A. Introverted10-0.35
Mother's educational level26-0.40
P.S.I.A. Deviance factor11-0.43
Disorders (own)27-0.49
Disorders (parents and siblings)27-0.51
P.S.I.A. Just10-0.55
P.S.I.A. Extreme10-0.55
Observed behaviour6-0.71

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.

Raw scoreUpward g (n)Downward g (n)
00.89 (373)NaN (0)
150.83 (219)0.85 (27)
230.73 (81)0.86 (232)
31NaN (0)0.88 (341)
40NaN (0)0.89 (373)



Scores by age

Age class n median score
50 to 5438.0
45 to 49328.0
40 to 44426.5
35 to 39825.0
30 to 34123.0
25 to 29523.0
22 to 24522.0
20 or 21112.0

Scores by year taken

Year taken n median score

ryear taken × median score = -0.70 (n = 30)

Robustness and overall test quality

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. There is currently no reason to revise this test.