Resolvable Designs With Unequal Block Sizes |
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Authors: | JA John KG Russell ER Williams & D Whitaker |
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Institution: | University of Waikato, Hamilton, New Zealand,;University of Wollongong, New South Wales, Australia,;CSIRO Forestry and Forest Products, Kingston, Australia |
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Abstract: | Resolvable block designs for v varieties in blocks of size k require v to be a multiple of k so that all blocks are of the same size. If a factorization of v is not possible then a resolvable design with blocks of unequal size is necessary. Patterson & Williams (1976) suggested the use of designs derived from α -designs and conjectured that such designs are likely to be very efficient in the class of resolvable designs with block sizes k and k – 1. This paper examines these derived designs and compares them with designs generated directly using an interchange algorithm. It concludes that the derived designs should be used when v is large, but that for small v they can be relatively inefficient. |
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Keywords: | A-optimality α-designs average efficiency factor interchange algorithm (M S)-optimality resolvable designs simulated annealing upper bounds |
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