Preece, D.A and Brading, P.W and Lam, C.W.H and Cote, M. (1994) Balanced 6x6 designs for 4 equally replicated treatments. Discrete Mathematics , 125 (1-3). pp. 319-327. ISSN 0012-365X .
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This paper considers 6 x 6 row-and-column designs in which (i) each of 4 treatments is replicated 9 times, (ii) each treatment occurs either once or twice in each row and each column, (iii) exactly 2 treatments are duplicated in each row and each column, and (iv) each of the 6 pairs of treatments is duplicated in exactly one row and exactly one column. These designs are balanced in a statistical as well as combinatorial sense and have been of statistical interest for more than 40 years. But they have not hitherto been enumerated. A backtracking search process  has now been used to enumerate the designs that are inequivalent under independent row permutations, column permutations, relabelling of the treatments and transposition about the main diagonal; just over half-a-million inequivalent designs were found. With attention restricted to designs symmetrical about the main diagonal, 920 designs were found, including only 2 with automorphism group of size 12 (the maximum possible). Some balanced superimpositions of one of the designs of another are presented.
|Subjects:||Q Science > QA Mathematics (inc Computing science)|
|Divisions:||Faculties > Science Technology and Medical Studies > School of Mathematics Statistics and Actuarial Science|
|Depositing User:||O.O. Odanye|
|Date Deposited:||16 Jun 2009 01:04|
|Last Modified:||16 Jun 2009 01:04|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/19960 (The current URI for this page, for reference purposes)|
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