# Statistics of A-18

© Paul Cooijmans

## Introduction

The A-18 was an early experimental association test.

## Scores on A-18 - Early experimental association test in Netherlandic as of 7 February 2023

**Contents type**: Verbal. **Period**: 1995-1996

2 | * |

3 | * |

9 | * |

10 | ** |

13 | * |

17 | * |

## Scores by males

*n* = 3

## Scores by females

*n* = 4

## Correlation of A-18 - Early experimental association test in Netherlandic with other mental ability tests

Test name | *n* | *r* |

Association subtest of Long Test For Genius (Netherlandic) | 2 | 1.00 |

A-15 - Early experimental association test in Netherlandic, 32 items | 3 | 0.94 |

A-22 - Early experimental association test in Netherlandic, 27 items (maximum score 31) | 4 | 0.82 |

A-16 - Early experimental association test in Netherlandic, 21 items | 4 | 0.80 |

A-19 - Early experimental association test in Netherlandic, 23 items | 3 | 0.61 |

Unknown and miscellaneous tests | 6 | 0.58 |

A-12 - Early experimental oral association test in Netherlandic, 40 items | 3 | 0.40 |

Weighted average of correlations: 0.710 (*N* = 25, weighted sum = 18)

Estimated *g* factor loading: 0.84

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, including possible floor/ceiling scores or outliers.

## Compound correlation of A-18 - Early experimental association test in Netherlandic with other mental ability tests

Test name | *n* | *r* |

Compound variable of all other tests with norms | 22 | .69 |

Weighted average of correlations: 0.693 (*N* = 22, weighted sum = 15.24)

Because there are not enough other tests with trustworthy norms in the regular table with correlations above to norm the test in the usual way, the correlation with the compound variable comprising all known other normed scores has been computed, and these tests are used for norming. Do notice that this includes tests having only one pair with the object test, which therefore do not show up in regular table of correlations (because multiple pairs are needed to compute a correlation, obviously).

## National medians for A-18 - Early experimental association test in Netherlandic

Country | *n* | median score |

Netherlands | 7 | 10.0 |

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 of A-18 - Early experimental association test in Netherlandic with personal details

Personalia | *n* | *r* |

Sex | 7 | 0.15 |

Year of birth | 7 | -0.62 |

## Estimated *g* factor loadings for restricted ranges

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 these values to be lower than the test's full-range *g* loading.

Below 1st quartile | -0.71 (8) |

Below median | 0.67 (18) |

Above median | 0.95 (10) |

Above 3rd quartile | 1.00 (4) |

## Scores by age

Age class | *n* | Median score |

45 to 49 | 2 | 11.5 |

35 to 39 | 1 | 17.0 |

30 to 34 | 2 | 6.5 |

25 to 29 | 1 | 9.0 |

14 | 1 | 2.0 |

*N* = 7

## Scores by year taken

Year taken | *n* | median score |

1995 | 7 | 10.0 |