pub fn ability_cov() -> Result<(DataFrame, Vec<usize>, usize), PolarsError>Expand description
§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 https://doi.org/10.1016/0160-2896%2883%2990010-7.
§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")