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Biometrika 1991 78(2):337-348; doi:10.1093/biomet/78.2.337
© 1991 by Biometrika Trust
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Some universally optimal row-column designs with empty nodes

FRANCES P. STEWART and RALPH A. BRADLEY

Department of Statistics, University of Georgia Athens, Georgia 30602, U.S.A.

General forms of the reduced coefficient matrix for estimation of treatment effects and the intrablock analysis of variance of row-column designs with n experimental units and v treatments are obtained from earlier work by the authors. These results are used to identify desirable properties for row-column designs with empty nodes. A need for such designs is apparent when the blocking criteria are implemented in sequence and empty nodes do not represent wasted experimental units. The construction and properties of three special classes of row-column designs with some empty nodes are discussed and examples given. In particular, it is shown that, if a row-column design belongs to one of these classes, then it is universally optimal for specified design parameters, where universally optimal designs are designs that maximize a generalized optimality criterion as defined by Kiefer.

Key Words: Intrablock analysis of variance • Multidimensional block design • Structurally incomplete row-column design • Universal optimality • Variance balance


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