datasets (version 3.3)

ability.cov: Ability and Intelligence Tests

Description

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

Usage

ability.cov

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.

Details

The tests are described as [object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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

References

Smith, G. A. and Stanley G. (1983) Clocking $g$: relating intelligence and measures of timed performance. Intelligence, 7, 353--368.

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")