twins


The given data are IQ scores from identical twins; one raised in a foster home, and the other raised by birth parents.


datasets

This package is a companion to the textbook S. Weisberg (2005),
"Applied Linear Regression," 3rd edition, Wiley. It includes all the
data sets discussed in the book (except one), and a few functions that
are tailored to the methods discussed in the book.  As of version 2.0.0,
this package depends on the car package. Many functions formerly
in alr3 have been renamed and now reside in car.
Data files have beeen lightly modified to make some data columns row labels.

Sanford Weisberg

alr3

Data to accompany Applied Linear Regression 3rd edition

twins function

This data frame contains the following columns:
 <dl>
    <dt>C</dt><dd>
 Social class, 1=high, 2=medium, 3=low
    </dd> <dt>IQb</dt><dd>
 biological
    </dd> <dt>IQf</dt><dd>
 foster
    </dd> </dl> 

Format

Burt, C. (1966). The genetic estimation of differences in intelligence: A study of monozygotic twins reared together and apart. <em>Br. J. Psych.</em>, 57, 147-153.

twins: Burt's twin data

Description

Arguments

Format

Source

References

Examples