twinIQ {RbyExample}

Twins IQ Data

Description

Twins IQ Data

Usage

twinIQ

Format

Data frame of Burt's IQ data for twins: 27 obs. of 3 variables

Foster

IQ of twin raised with foster parents.

Biological

IQ of twin raised with biological parents.

Social

Social class of biological parents (high, low, middle)

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. Data is provided in R packages faraway and UsingR.