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 (2014),
"Applied Linear Regression," 4rd edition, Wiley. It includes all the
data sets discussed in the book and one function to access the textbook's
website.
This package depends on the car package.  Many data files in this package
are included in the alr3 package as well, so only one of them should be
loaded.

Sanford Weisberg

alr4

Data to accompany Applied Linear Regression 4rd edition

twins function

This data frame contains the following columns:
 <dl>
    <dt>C</dt><dd>
 Social class, C1=high, C2=medium, C3=low, a factor
    </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