(1) Mathematical Institute, Slovak Academy of Sciences, tefánikova 49, 81473 Bratislava, Slovak Republic
Abstract:
The paper concludes our investigations in looking for the locally best linear-quadratic estimators of mean value parameters and of the covariance matrix elements in a special structure of the linear model (2 variables case) where the dispersions of the observed quantities depend on the mean value parameters. Unfortunately there exists no linear-quadratic improvement of the linear estimator of mean value parameters in this model.