Schonemann, P. H. & Jaccard, J.
Expected mean squares for extended twin designs. A projection approach
Chinese Journal of Psychology, 2003, 45, 4, 337-343.
The projection approach is used to derive generic formulae for expected mean squares of extended twin designs. It is then shown how they can be used to obtain more stringent tests of the assumptions underlying variance components models used in behavior genetics than those afforded by global chi-square tests of fit in current use.