Partial tetra-allel crosses.
The construction of partical tetra-allel crosses (PTAC) is considered using BIB and PBIB designs with blocks of size four. It is shown how this can lead to certain types of balanced designs. An explicit procedure is given for constructing circulant PTAC's. The analysis of PTAC's - estimation of general effects of the lines involved and analysis of variance - is illustrated in terms of an example.
Iowa State University and Virginia Polytechnic Institute, Iowa, USA.
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Hinkelmann