Algebraical methods for studying correlatios in incomplete balanced block diagrams of experiment design. III. Sufficient statistical data and estimates of co variance matrices

Sufficient statistical data are obtained for Gaussian distributions of observations in incomplete design block diagrams under the assumption that the covariance matrix belongs to some of the subalgebras of the commutation algebra of the symmetry group of the experiment design. Unbiased estimates of covariance matrices of this class are found.