twins: Burt's twin data

Description Format Source References Examples

Description

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

Format

This data frame contains the following columns:

C

Social class, 1=high, 2=medium, 3=low

IQb

biological

IQf

foster

Source

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

References

Weisberg, S. (2005). Applied Linear Regression, 3rd edition. New York: Wiley, Problem 6.16.

Examples

1


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