Statistics of Mother's educational level

© Paul Cooijmans

Legenda

The educational levels reported by test candidates are encoded as follows:

Scores on Mother's educational level as of 12 November 2020

Contents type: Personal information.   

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Scores by males

n = 840

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Scores by females

n = 127

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Correlation of Mother's educational level with other tests by I.Q. Tests for the High Range

(Test index) Test name n r
(77) Analogies #170.66
(107) The Alchemist Test180.40
(76) Analogies subtest of Long Test For Genius (Netherlandic)60.30
(36) Reflections In Peroxide230.29
(72) Qoymans Automatic Test #1110.28
(48) Narcissus' last stand200.27
(84) Bonsai Test170.26
(87) Cooijmans Intelligence Test - Form 2620.26
(13) Laaglandse Aanlegtest - Herziening 201640.25
(109) The Bonsai Test - Revision 2016350.23
(85) Cooijmans Intelligence Test - Form 1160.23
(82) Reason380.22
(43) Test For Genius - Revision 2010340.21
(62) Reason Behind Multiple-Choice310.20
(24) Reason - Revision 2008850.17
(19) Numerical section of Test For Genius - Revision 2010850.16
(26) Verbal section of Test For Genius - Revision 20041070.15
(66) Test For Genius - Revision 2004760.14
(23) Gliaweb Riddled Intelligence Test - Revision 20111650.13
(45) Numerical and spatial sections of The Marathon Test450.13
(21) Psychometric Qrosswords180.12
(28) The Test To End All Tests460.10
(39) Combined Numerical and Spatial sections of Test For Genius - Revision 2010520.10
(27) Spatial section of Test For Genius - Revision 20041210.10
(40) Reason Behind Multiple-Choice - Revision 2008830.09
(65) Long Test For Genius (Netherlandic)50.09
(74) Cooijmans On-Line Test150.08
(47) Psychometrically Activated Grids Acerbate Neuroticism120.08
(37) Problems In Gentle Slopes of the third degree320.08
(2) Cooijmans Intelligence Test - Form 31490.07
(56) Short Test For Genius110.06
(46) Labyrinthine LIMIT150.05
(5) Daedalus Test280.05
(11) Isis Test630.04
(68) Numbers530.04
(55) Spatial Insight Test230.03
(30) Verbal section of The Marathon Test340.02
(42) The Marathon Test300.02
(7) The Final Test600.01
(51) Qoymans Multiple-Choice #1140.01
(18) The Nemesis Test430.01
(112) Combined Numerical and Spatial sections of Test For Genius - Revision 2016360.01
(35) Intelligence Quantifier by assessment720.01
(31) Numerical section of The Marathon Test470.00
(71) Numerical Insight Test130.00
(80) Qoymans Multiple-Choice #4144-0.00
(33) Problems In Gentle Slopes of the first degree20-0.01
(106) Cooijmans Intelligence Test - Form 472-0.01
(111) Test For Genius - Revision 201629-0.03
(116) Gliaweb Riddled Intelligence Test (old version)42-0.03
(3) Qoymans Multiple-Choice #586-0.03
(16) Lieshout International Mesospheric Intelligence Test94-0.03
(32) Spatial section of The Marathon Test46-0.04
(108) Verbal section of Test For Genius - Revision 201628-0.04
(105) Space, Time, and Hyperspace - Revision 201638-0.05
(57) Space, Time, and Hyperspace55-0.06
(25) The Sargasso Test48-0.10
(44) Associative LIMIT64-0.11
(79) Association subtest of Long Test For Genius38-0.11
(59) Association and Analogies (German)5-0.12
(104) The Final Test - Revision 201319-0.12
(69) Odds21-0.12
(10) Genius Association Test99-0.12
(53) Qoymans Multiple-Choice #382-0.13
(1) Cartoons of Shock48-0.14
(50) Qoymans Automatic Test #211-0.14
(4) A Paranoiac's Torture: Intelligence Test Utilizing Diabolic Exactitude28-0.14
(12) Cooijmans On-Line Test - Two-barrelled version34-0.17
(0) Test of the Beheaded Man40-0.18
(52) Qoymans Multiple-Choice #215-0.23
(83) KIT Intelligence Test - first attempts14-0.23
(103) Problems In Gentle Slopes of the second degree30-0.25
(110) Cooijmans Intelligence Test 527-0.25
(117) The Hammer Of Test-Hungry - Revision 201318-0.29
(29) Words21-0.32
(54) Test of Shock and Awe16-0.33
(114) Dicing with death8-0.33
(63) Long Test For Genius28-0.35
(113) The Piper's Test6-0.35
(75) Analogies of Long Test For Genius33-0.43
(41) The LAW - Letters And Words18-0.47
(15) Letters20-0.48
(34) De Roskam4-0.50
(73) Qoymans Automatic Test #38-0.54
(81) Association subtest of Long Test For Genius (Netherlandic)6-0.56
(22) Gliaweb Raadselachtig Analogieënproefwerk4-0.64
(14) Low Countries Aptitude Test7-0.64
(86) Evens9-0.82
(8) Female Intelligence Test5-0.92
(49) The Hammer Of Test-Hungry4-0.93

Weighted average of correlations: 0.006 (N = 3452, weighted sum = 22.22)

Conservatively estimated minimum g loading: 0.08

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 Mother's educational level with tests by others

(Test index) Test name n r
(203) Wechsler Adult Intelligence Scales for Children70.93
(208) California Test of Mental Maturity50.64
(244) Scholastic Aptitude Test (new)100.52
(243) Scholastic Aptitude Test (old)170.46
(221) National I.Q. Tests40.45
(241) Ultra Test90.41
(225) Logima Strictica 36480.38
(238) 916 Test200.38
(223) Strict Logic Sequences Exam II170.32
(232) GMAT40.30
(226) Logima Strictica 24160.29
(214) Epiq Tests140.28
(227) Concep-T80.24
(237) Sigma Test210.22
(233) Hoeflin Power Test60.22
(218) Raven's Advanced Progressive Matrices (I.Q.)260.22
(212) Raven's Advanced Progressive Matrices (raw)230.18
(236) International High IQ Society Miscellaneous tests520.17
(220) Cattell Culture Fair330.14
(217) G-test80.11
(206) W-8780.10
(239) Titan Test180.05
(229) Mega Test90.02
(242) Unknown and miscellaneous tests220-0.01
(234) Strict Logic Sequences Exam I70-0.01
(201) Wechsler Adult Intelligence Scales36-0.02
(211) Culture Fair Numerical Spatial Examination - Final version56-0.04
(231) Mysterium Entrance Exam30-0.05
(240) Strict Logic Spatial Exam 4828-0.12
(235) Nonverbal Cognitive Performance Examination39-0.15
(230) Omega Contemplative Items Pool7-0.18
(219) Graduate Record Examination11-0.20
(247) Advanced Intelligence Test11-0.20
(246) Sequentia Numerica Form I13-0.22
(204) Chimera High Ability Riddle Test5-0.26
(202) Cattell Verbal7-0.28
(200) American College Testing program15-0.29
(209) Drenth number series5-0.37
(205) Cito-toets12-0.39
(224) Test of Inductive Reasoning12-0.59
(213) Encephalist - R6-0.80
(228) Miller Analogies Test (raw; old version)7-0.89

Weighted average of correlations: 0.048 (N = 973, weighted sum = 46.96)

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.

Correlation of Mother's educational level with other tests by I.Q. Tests for the High Range - for females

(Test index) Test name n r
(26) Verbal section of Test For Genius - Revision 200440.89
(87) Cooijmans Intelligence Test - Form 240.69
(35) Intelligence Quantifier by assessment70.55
(16) Lieshout International Mesospheric Intelligence Test40.52
(23) Gliaweb Riddled Intelligence Test - Revision 2011150.45
(116) Gliaweb Riddled Intelligence Test (old version)40.30
(44) Associative LIMIT40.28
(24) Reason - Revision 200850.17
(1) Cartoons of Shock50.13
(106) Cooijmans Intelligence Test - Form 450.13
(40) Reason Behind Multiple-Choice - Revision 200850.12
(2) Cooijmans Intelligence Test - Form 3140.05
(3) Qoymans Multiple-Choice #550.02
(10) Genius Association Test6-0.04
(80) Qoymans Multiple-Choice #415-0.07
(53) Qoymans Multiple-Choice #39-0.62

Weighted average of correlations: 0.162 (N = 111, weighted sum = 18.00)

Conservatively estimated minimum g loading among females: 0.40

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.

Estimated loadings of Mother's educational level 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.

Typeng loading of Mother's educational level on that type
Verbal914-0.24
Numerical2280.16
Spatial3770.08
Logical1660.40
Heterogeneous10990.13

N = 2784

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

Balanced g loading = 0.11

National means for Mother's educational level

Country n mean score
Chile36.00
Hungary26.00
Bulgaria85.75
Russia35.67
Argentina65.50
Cuba25.50
Iran45.50
India245.13
New_Zealand45.00
Serbia25.00
Switzerland55.00
South_Africa94.89
Romania64.83
Philippines54.80
Poland144.79
Singapore34.67
United_States2674.58
Israel74.57
Canada284.54
Nigeria44.50
Thailand24.50
Greece244.42
Yugoslavia54.40
United_Kingdom414.39
Korea_South164.38
Malaysia34.33
France194.32
Sweden584.22
Austria114.18
Japan94.11
Italy194.11
Australia174.00
China194.00
Czech_Republic34.00
Norway134.00
Portugal44.00
Slovenia44.00
Germany683.91
Belgium203.90
Netherlands773.87
Finland273.78
Brazil123.75
Mexico73.57
Denmark133.46
Bosnia_and_Herzegovina43.25
Turkey113.09
Croatia23.00
Spain232.61
Slovakia22.50
Hong_Kong52.20
Cyprus32.00

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

Correlation with national I.Q.'s of Mother's educational level

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

Correlation of Mother's educational level with personal details

Personalia n r
Father's educational level9550.60
Year of birth9680.24
P.S.I.A. Rational - Revision 2007700.10
Cooijmans Inventory of Neo-Marxist Attitudes420.09
P.S.I.A. Cruel - Revision 2007700.06
Disorders (own)9650.04
Gifted Adult's Inventory of Aspergerisms740.04
Educational level968-0.00
Disorders (parents and siblings)964-0.00
P.S.I.A. Rare - Revision 200770-0.00
P.S.I.A. Neurotic - Revision 200770-0.00
Sex968-0.01
P.S.I.A. Aspergoid - Revision 200770-0.07
Observed associative horizon35-0.07
P.S.I.A. True - Revision 200770-0.07
P.S.I.A. Just - Revision 200770-0.08
P.S.I.A. Ethics factor - Revision 200770-0.08
P.S.I.A. Orderly - Revision 200770-0.11
P.S.I.A. Antisocial - Revision 200770-0.11
P.S.I.A. Cold - Revision 200770-0.11
P.S.I.A. Introverted - Revision 200770-0.12
P.S.I.A. System factor - Revision 200770-0.13
Observed behaviour84-0.15
P.S.I.A. Deviance factor - Revision 200770-0.23
P.S.I.A. Extreme - Revision 200770-0.27

Observation: There is a significant moderate positive correlation of Father's educational level with Mother's educational level, reflecting assortative mating, one presumes. Virtually the same correlation is seen below for both the female and the male candidates separately, which makes sense given that the assortative mating took place before the candidate (child) was conceived, and can therefore not have been affected by the sex of the candidate. The fact that this correlation is so alike within-sex confirms that it is genuine, and also confirms that the statistic was reported correctly on the whole.

Correlation with personal details of Mother's educational level - within females

Personalia n r
Gifted Adult's Inventory of Aspergerisms50.94
Father's educational level1270.61
P.S.I.A. Rational - Revision 200780.54
Year of birth1270.23
Educational level1270.14
P.S.I.A. Neurotic - Revision 200780.11
Disorders (own)1270.09
Disorders (parents and siblings)127-0.09
P.S.I.A. Aspergoid - Revision 20078-0.14
P.S.I.A. Rare - Revision 20078-0.14
P.S.I.A. Orderly - Revision 20078-0.17
P.S.I.A. Cruel - Revision 20078-0.24
Observed associative horizon5-0.25
P.S.I.A. Extreme - Revision 20078-0.26
P.S.I.A. Cold - Revision 20078-0.33
P.S.I.A. Antisocial - Revision 20078-0.34
P.S.I.A. Deviance factor - Revision 20078-0.38
P.S.I.A. Just - Revision 20078-0.44
P.S.I.A. System factor - Revision 20078-0.45
P.S.I.A. Ethics factor - Revision 20078-0.48
P.S.I.A. True - Revision 20078-0.48
Observed behaviour7-0.50
P.S.I.A. Introverted - Revision 20078-0.61

Correlation with personal details of Mother's educational level - within males

Personalia n r
Father's educational level8270.60
Year of birth8400.24
Cooijmans Inventory of Neo-Marxist Attitudes420.09
P.S.I.A. Rational - Revision 2007620.07
P.S.I.A. Cruel - Revision 2007620.06
Disorders (own)8370.03
Disorders (parents and siblings)8360.01
P.S.I.A. Rare - Revision 2007620.01
P.S.I.A. Neurotic - Revision 200762-0.01
P.S.I.A. True - Revision 200762-0.02
Educational level840-0.02
Gifted Adult's Inventory of Aspergerisms69-0.03
P.S.I.A. Ethics factor - Revision 200762-0.04
Observed associative horizon30-0.04
P.S.I.A. Introverted - Revision 200762-0.07
P.S.I.A. Aspergoid - Revision 200762-0.08
P.S.I.A. Just - Revision 200762-0.08
P.S.I.A. Orderly - Revision 200762-0.10
P.S.I.A. Cold - Revision 200762-0.11
P.S.I.A. Antisocial - Revision 200762-0.11
P.S.I.A. System factor - Revision 200762-0.13
Observed behaviour77-0.14
P.S.I.A. Deviance factor - Revision 200762-0.22
P.S.I.A. Extreme - Revision 200762-0.26

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)
00.08 (3452)NaN (0)
1-0.02 (3424)0.57 (39)
20.07 (3327)0.18 (292)
3-0.08 (3053)-0.23 (745)
4-0.20 (2640)0.16 (2111)
5-0.30 (1282)0.18 (2841)
6-0.40 (489)0.19 (3332)
7NaN (0)0.08 (3452)

Observation: Only downward of Mother's educational level 1 (a few years primary school) does this statistic have noticeable g loading. The upward g loading is even negative from level 3 (a few years secondary school) on, and increasingly so as Mother's educational level goes up.

Conclusions

  1. There is, on the whole, a tiny positive correlation of Mother's educational level with candidate's high-range I.Q. test scores (it is in fact .01 to .05); on average this correlation is even smaller than that seen with Father's educational level;
  2. Within females, however, there is a small positive correlation of about .16;
  3. Only downward of Mother's educational level 1 (a few years primary school) there seems to be a somewhat higher correlation with I.Q.;
  4. There is a significant moderate positive correlation of Father's educational level with Mother's educational level, reflecting assortative mating.

General observations

After seeing the statistics of candidate's, mother's, and father's educational levels, the following general observations can be made with significance:

  1. There are very small positive correlations of high-range I.Q. scores with the three indicators of educational level;
  2. Only for the lowest few educational levels is the correlation somewhat larger;
  3. Within female candidates, the correlations with the three indicators of educational level are higher than within male candidates; given that females score a bit lower than males on high-range tests, these higher correlations are consistent with the phenomenon that the correlation of I.Q. with educational level is higher over the full range than in the high range;
  4. The correlations with Mother's educational level are lower than those with Father's educational level, and are even increasingly negative from level 3 (a few years secondary school) upward.

Disclaimer

These reports are based exclusively on statistics of high-range intelligence tests. Over the full range of I.Q. and the general population, the correlations of I.Q. scores with the indicators of educational level are known to be much higher than reported here. Likely, this difference has to do with phenomena like attenuation due to restriction of range, and Spearman's "law of diminishing returns" regarding g.