twins

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

datasets

Datasets to Accompany S. Weisberg (2014),
"Applied Linear Regression," 4th edition.  Many data files
in this package are included in the alr3 package as well, so only one of them
should be used.

Sanford Weisberg

alr4

Data to Accompany Applied Linear Regression 4th 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's twin data — twins

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>

twins: Burt's twin data

Description

Arguments

Format

References

Examples