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Row-column factorial designs with multiple levels
Journal of Combinatorial Designs ( IF 0.5 ) Pub Date : 2021-07-20 , DOI: 10.1002/jcd.21799
Fahim Rahim 1 , Nicholas J. Cavenagh 1
Affiliation  

An m × n row-column factorial design is an arrangement of the elements of a factorial design into a rectangular array. Such an array is used in experimental design, where the rows and columns can act as blocking factors. Formally, for any integer q, let [ q ] = { 0 , 1 , , q 1 } . The q k (full) factorial design with replication α is the multiset consisting of α occurrences of each element of [ q ] k ; we denote this by α × [ q ] k . A regular m × n row-column factorial design is an arrangement of the elements of α × [ q ] k into an m × n array (which we say is of type I k ( m , n ; q ) ) such that for each row (column) and fixed vector position i [ k ] , each element of [ q ] occurs n q times (respectively, m q times). Let m n. We show that an array of type I k ( m , n ; q ) exists if and only if (a) q m and q n; (b) q k m n; (c) ( k , q , m , n ) ( 2 , 6 , 6 , 6 ) , and (d) if ( k , q , m ) = ( 2 , 2 , 2 ) then 4 divides n. Godolphin showed the above is true for the case q = 2 when m and n are powers of 2. In the case k = 2, the above implies necessary and sufficient conditions for the existence of a pair of mutually orthogonal frequency rectangles (or F-rectangles) whenever each symbol occurs the same number of times in a given row or column.

中文翻译:

多水平行列因子设计

一个 × n 行列因子设计是将因子设计的元素排列成矩形阵列。这样的阵列用于实验设计,其中行和列可以充当分块因子。形式上,对于任何整数 q, 让 [ q ] = { 0 , 1 , , q - 1 } . 这 q 带复制的(完全)因子设计 α 是由以下组成的多重集 α 每个元素的出现次数 [ q ] ; 我们用 α × [ q ] . 一个普通的 × n 行列因子设计是元素的排列 α × [ q ] × n数组(我们说它的类型是 一世 ( , n ; q ) ) 使得对于每一行(列)和固定的向量位置 一世 [ ] , 每个元素 [ q ] 发生 n q 次(分别为 q次)。让 n. 我们证明了一个类型的数组 一世 ( , n ; q ) 存在当且仅当 (a) q q n; (二) q n; (C) ( , q , , n ) ( 2 , 6 , 6 , 6 ) , 和 (d) 如果 ( , q , ) = ( 2 , 2 , 2 ) 然后4除 n. Godolphin 证明上述情况适用于这种情况 q = 2 什么时候 n 是 2 的幂。在这种情况下 = 2,以上暗示了一对相互正交的频率矩形(或 F-rectangles) 只要每个符号在给定的行或列中出现相同的次数。
更新日期:2021-09-15
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