| ability.cov | R Documentation |
Six tests were given to 112 individuals. The covariance matrix is given in this object.
ability.cov
The tests are described as
a non-verbal measure of general intelligence using Cattell's culture-fair test.
a picture-completion test
block design
mazes
reading comprehension
vocabulary
Bartholomew gives both covariance and correlation matrices, but these are inconsistent. Neither are in the original paper.
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.
Smith, G. A. and Stanley G. (1983). Clocking g: relating intelligence and measures of timed performance. Intelligence, 7, 353–368. \Sexpr[results=rd,stage=build]{tools:::Rd_expr_doi("10.1016/0160-2896(83)90010-7")}.
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")
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