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<table width="100%" summary="page for Burt"><tr><td>Burt</td><td align="right">R Documentation</td></tr></table>

<h2>Fraudulent Data on IQs of Twins Raised Apart</h2>

<h3>Description</h3>


<p>The <code>Burt</code> data frame has 27 rows and 4 columns.
The &ldquo;data&rdquo; were simply (and notoriously) manufactured.  The
same data are in the dataset &ldquo;twins&quot; in the <code>alr3</code>
package, but with different labels.
</p>


<h3>Usage</h3>

<pre>
Burt
</pre>


<h3>Format</h3>


<p>This data frame contains the following columns:
</p>

<dl>
<dt>IQbio</dt><dd>
<p>IQ of twin raised by biological parents
</p>
</dd>
<dt>IQfoster</dt><dd>
<p>IQ of twin raised by foster parents
</p>
</dd>
<dt>class</dt><dd>
<p>A factor with levels (note: out of order):
<code>high</code>;
<code>low</code>;
<code>medium</code>.
</p>
</dd>
</dl>



<h3>Source</h3>


<p>Burt, C. (1966) 
The genetic determination of differences in intelligence: 
A study of monozygotic twins reared together and apart. 
<EM>British Journal of Psychology</EM> <B>57</B>, 137&ndash;153.
</p>


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