Fraudulent Data on IQs of Twins Raised Apart
Burt data frame has 27 rows and 4 columns.
The ``data'' were simply (and notoriously) manufactured. The
same data are in the dataset ``twins" in the
package, but with different labels.
Burt, C. (1966) The genetic determination of differences in intelligence: A study of monozygotic twins reared together and apart. British Journal of Psychology 57, 137--153.