ability.cov {stats} | R Documentation

## Ability and Intelligence Tests

### Description

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

### Usage

    data(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

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

Barthlomew, 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.

### Examples

    data(ability.cov)
    (ability.FA <- factanal(factors = 1, covmat=ability.cov))
    update(ability.FA, factors=2)
    update(ability.FA, factors=2, rotation="promax")

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