Burt


The <code>Burt</code> data frame has 27 rows and 4 columns.
The ``data'' were simply (and notoriously) manufactured.  The
same data are in the dataset ``twins" in the <code>alr3</code>
package, but with different labels.


datasets


Functions and Datasets to Accompany J. Fox and S. Weisberg,
An R Companion to Applied Regression, Second Edition, Sage, 2011.

John Fox

Companion to Applied Regression

Burt function

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

Format

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--153. 

Burt: Fraudulent Data on IQs of Twins Raised Apart

Description

Usage

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Format

Source