ability.cov {datasets} | R Documentation

## Ability and Intelligence Tests

### Description

Six tests were given to 112 individuals. The covariance matrix is given in this object.

### Usage

    ability.cov

### Details

The tests are described as

general:

  a non-verbal measure of general intelligence using Cattell's culture-fair test.

picture:

  a picture-completion test

blocks:

  block design

maze:

  mazes

reading:

  reading comprehension

vocab:

  vocabulary

Bartholomew gives both covariance and correlation matrices, but these are inconsistent. Neither are in the original paper.

### Source

Bartholomew, D. J. (1987). Latent Variable Analysis and Factor Analysis. Griffin.

Bartholomew, D. J. and Knott, M. (1990). Latent Variable Analysis and Factor Analysis. Second Edition, Arnold.

### References

Smith, G. A. and Stanley G. (1983). Clocking g: relating intelligence and measures of timed performance. Intelligence, 7, 353–368. doi: 10.1016/0160-2896(83)90010-7.

### Examples

    require(stats)
    (ability.FA <- factanal(factors = 1, covmat = ability.cov))
    update(ability.FA, factors = 2)
    ## The signs of factors and hence the signs of correlations are
    ## arbitrary with promax rotation.
    update(ability.FA, factors = 2, rotation = "promax")

[Package datasets version 3.6.0 Index]