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% File src/library/datasets/man/ability.cov.Rd
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% File src/library/datasets/man/ability.cov.Rd
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% Part of the R package, https://www.R-project.org
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% Part of the R package, https://www.R-project.org
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% Copyright 1995-2007 R Core Team
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% Copyright 1995-2018 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\name{ability.cov}
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\name{ability.cov}
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\docType{data}
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\docType{data}
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\alias{ability.cov}
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\alias{ability.cov}
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  Bartholomew gives both covariance and correlation matrices,
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  Bartholomew gives both covariance and correlation matrices,
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  but these are inconsistent.  Neither are in the original paper.
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  but these are inconsistent.  Neither are in the original paper.
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}
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}
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\usage{ability.cov}
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\usage{ability.cov}
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\source{
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\source{
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  Bartholomew, D. J. (1987).
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  Bartholomew, D. J. (1987) \emph{Latent Variable Analysis and Factor
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  \emph{Latent Variable Analysis and Factor Analysis}.
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    Analysis.} Griffin.
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  Griffin.
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  Bartholomew, D. J.  and Knott, M. (1990) \emph{Latent Variable Analysis
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  Bartholomew, D. J. and Knott, M. (1990).
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  \emph{Latent Variable Analysis and Factor Analysis}.
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    and Factor Analysis.} Second Edition, Arnold.
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  Second Edition, Arnold.
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}
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}
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\references{
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\references{
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  Smith, G. A. and Stanley G. (1983)
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  Smith, G. A. and Stanley G. (1983).
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  Clocking \eqn{g}: relating intelligence and measures of timed
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  Clocking \eqn{g}: relating intelligence and measures of timed
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  performance.
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  performance. \emph{Intelligence}, \bold{7}, 353--368.
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  \emph{Intelligence}, \bold{7}, 353--368.
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  \doi{10.1016/0160-2896(83)90010-7}.
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}
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}
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\examples{\donttest{
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\examples{\donttest{
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require(stats)
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require(stats)
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(ability.FA <- factanal(factors = 1, covmat = ability.cov))
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(ability.FA <- factanal(factors = 1, covmat = ability.cov))
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update(ability.FA, factors = 2)
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update(ability.FA, factors = 2)