Description

A 1989 study investigated the effect of heredity and environment on intelligence. Data are the IQ scores for adopted children whose biological and adoptive parents were categorized either in the highest or the lowest socioeconomic status category.

Usage

Format

A data frame with 38 observations on the following 3 variables.

IQ

IQ scores of adopted children

Adoptive

a factor with levels "High" and "Low"; the socioeconomic status of the adoptive parents

Biologic

a factor with levels "High" and "Low"; the socioeconomic status of the biological parents

Source

Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.

References

Capron, C. and Duyme, M. (1991). Children's IQ's and SES of Biological and Adoptive Parents in a Balanced Cross-fostering Study, European Bulletin of Cognitive Psychology 11(3): 323–348.

See Also

ex1605

Examples