Statistics of SloBrain

Warning

The below statistics are based on self-reported scores, and therefore of limited value. Since it concerns a performance test, people may report flattering results, and even if proof is shown, they may have done many attempts and only shown the best. About the same is true for self-reported scores on I.Q. tests, which often have little relation to one's true intelligence level. Also, the correlations in this report are in nearly all cases not significant due to too low numbers of pairs. This is not mentioned explicitly in each case, so keep it in mind.

And, it must be pointed out that reaction time normally increases with age in adults, possibly through the loss of myelination and resulting decrease of nerve conduction velocity. Other than a non-significant negative correlation with birth year, there is not by far enough information in these statistics to study or reveal any development with age.

Correlation between the two SloBrain statistics

r_{mean reaction time × reaction time standard deviation} = .74 (n = 36)

So, persons with shorter reaction times are significantly more consistent, have their reaction times closer together.

Scores on SloBrain - Mean reaction time as of 17 September 2020

Contents type: Elementary cognitive task.   Period: 2004-present

• n: 36
• Median: 309.8
• Quartile deviation: 68.8
• Range: 775.6
• Minimum possible: 0
• Male median: 307.4 (n = 32)
• Female median: 460.2 (n = 4)

Scores by males

n = 32

Scores by females

n = 4

Correlation of SloBrain - Mean reaction time with other tests by I.Q. Tests for the High Range

Weighted average of correlations: -0.694 (N = 29, weighted sum = -20.12)

Conservatively estimated minimum g loading: -0.83

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 SloBrain - Mean reaction time with tests by others

Weighted average of correlations: 0.094 (N = 23, weighted sum = 2.15)

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 SloBrain - Mean reaction time 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 = 21

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

Balanced g loading = -0.85

National medians for SloBrain - Mean reaction time

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 SloBrain - Mean reaction time

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

• r = -0.34 (n = 14)

Correlation of SloBrain - Mean reaction time with personal details

Scores on SloBrain - Reaction time standard deviation as of 17 September 2020

Contents type: Elementary cognitive task.   Period: 2004-present

• n: 36
• Median: 42.2
• Quartile deviation: 15.8
• Range: 1291.47
• Minimum possible: 0
• Male median: 41.1 (n = 32)
• Female median: 180.6 (n = 4)

Scores by males

n = 32

Scores by females

n = 4

Correlation of SloBrain - Reaction time standard deviation with other tests by I.Q. Tests for the High Range

Weighted average of correlations: -0.352 (N = 29, weighted sum = -10.21)

Conservatively estimated minimum g loading: -0.59

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 SloBrain - Reaction time standard deviation with tests by others

Weighted average of correlations: -0.157 (N = 23, weighted sum = -3.62)

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 SloBrain - Reaction time standard deviation 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 = 21

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

Balanced g loading = -0.24

National medians for SloBrain - Reaction time standard deviation

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 SloBrain - Reaction time standard deviation

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

• r = -0.02 (n = 14)

Correlation of SloBrain - Reaction time standard deviation with personal details

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