EVOLUTION-MANAGER
Edit File: ability.cov.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>R: Ability and Intelligence Tests</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="R.css" /> </head><body> <table width="100%" summary="page for ability.cov {datasets}"><tr><td>ability.cov {datasets}</td><td style="text-align: right;">R Documentation</td></tr></table> <h2>Ability and Intelligence Tests</h2> <h3>Description</h3> <p>Six tests were given to 112 individuals. The covariance matrix is given in this object. </p> <h3>Usage</h3> <pre>ability.cov</pre> <h3>Details</h3> <p>The tests are described as </p> <dl> <dt>general:</dt><dd><p>a non-verbal measure of general intelligence using Cattell's culture-fair test.</p> </dd> <dt>picture:</dt><dd><p>a picture-completion test</p> </dd> <dt>blocks:</dt><dd><p>block design</p> </dd> <dt>maze:</dt><dd><p>mazes</p> </dd> <dt>reading:</dt><dd><p>reading comprehension</p> </dd> <dt>vocab:</dt><dd><p>vocabulary</p> </dd> </dl> <p>Bartholomew gives both covariance and correlation matrices, but these are inconsistent. Neither are in the original paper. </p> <h3>Source</h3> <p>Bartholomew, D. J. (1987). <em>Latent Variable Analysis and Factor Analysis</em>. Griffin. </p> <p>Bartholomew, D. J. and Knott, M. (1990). <em>Latent Variable Analysis and Factor Analysis</em>. Second Edition, Arnold. </p> <h3>References</h3> <p>Smith, G. A. and Stanley G. (1983). Clocking <i>g</i>: relating intelligence and measures of timed performance. <em>Intelligence</em>, <b>7</b>, 353–368. doi: <a href="https://doi.org/10.1016/0160-2896(83)90010-7">10.1016/0160-2896(83)90010-7</a>. </p> <h3>Examples</h3> <pre> 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") </pre> <hr /><div style="text-align: center;">[Package <em>datasets</em> version 3.6.0 <a href="00Index.html">Index</a>]</div> </body></html>