\Header{ability.cov}{Ability and Intelligence Tests}
\keyword{datasets}{ability.cov}
\begin{Description}\relax
Six tests were given to 112 individuals. The covariance matrix is
given in this object.\end{Description}
\begin{Usage}
\begin{verbatim}data(ability.cov)\end{verbatim}
\end{Usage}
\begin{Details}\relax
Bartholomew gives both covariance and correlation matrices,
but these are inconsistent.  Neither are in the original paper.\end{Details}
\begin{Source}\relax
Barthlomew, D. J. (1987) \emph{Latent Variable Analysis and Factor
Analysis.} Griffin.\end{Source}
\begin{References}\relax
Smith, G. A. and Stanley G. (1983)
Clocking \eqn{g}{}: relating intelligence and measures of timed
performance. \emph{Intelligence}, \bold{7}, 353--368.\end{References}
\begin{Examples}
\begin{ExampleCode}
data(ability.cov)
(ability.FA <- factanal(factors = 1, covmat=ability.cov))
update(ability.FA, factors=2)
update(ability.FA, factors=2, rotation="promax")
\end{ExampleCode}
\end{Examples}

