+--------+-------------------+
| Burt   | R Documentation   |
+--------+-------------------+

Fraudulent Data on IQs of Twins Raised Apart
--------------------------------------------

Description
~~~~~~~~~~~

The ``Burt`` 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 ``alr3`` package, but with different labels.

Usage
~~~~~

::

    Burt

Format
~~~~~~

This data frame contains the following columns:

IQbio
    IQ of twin raised by biological parents

IQfoster
    IQ of twin raised by foster parents

class
    A factor with levels (note: out of order): ``high``; ``low``;
    ``medium``.

Source
~~~~~~

Burt, C. (1966) The genetic determination of differences in
intelligence: A study of monozygotic twins reared together and apart.
*British Journal of Psychology* **57**, 137–153.
