R/twinIQ.R

In RbyExample: Data for the Book "R by Example"

#' Twins IQ Data
#'
#' @format Data frame of Burt's IQ data for twins: 27 obs. of 3 variables
#' \describe{
#' \item{Foster}{IQ of twin raised with foster parents.}
#' \item{Biological}{IQ of twin raised with biological parents.}
#' \item{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.
"twinIQ"