C holesky Decomposition

Abstract The Cholesky decomposition is probably the most commonly used model in behavior genetic analysis. Referring to it as a model, however, is somewhat misleading, since it is, in fact, primarily a method for estimating a covariance structure under the constraint that the estimated covariance matrix is positive semidefinite. The specific parameter estimates of the decomposition are of less interest than the expected covariance matrix it implies.