中  華  心  理  學  刊
民92，45卷，4期，337-343

Peter H. Schonemann（Department of Psychological Scineces, Purdue University ）；James Jaccard（Department of Psychology, University of Albany）

Abstract

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 component models used in behavior genetics than those afforded by global chi-square tests of fit in current use.

Keywords：expected mean squares, projection approach, extended twin designs, variance components