A NOTE ON 2_(IV)~(m-p) DESIGNS WITH THE MAXIMUM NUMBER OF CLEAR TWO-FACTOR INTERACTIONS

In this article, the authors obtain some theoretical results for 2_(IV)~(m-p) designs to have the maximum number of clear two-factor interactions by considering the number of two-factor interactions that are not clear. Several 2_(IV)~(m-p) designs with the maximum number of clear two-factor interactions, judged using these results, are provided for illustration.     

一类包含最大数量纯净两因子交互效应的2IV^m-p设计

2IV^m-p设计包含纯净两因子交互效应的个数是衡量该设计优良性的重要标准之一．本文证明了某些最小低阶混杂的2IV^m-p设计包含最大数量的纯净两因子交互效应；并在文章的末尾给出了一类既具有最小低阶混杂又包含最大数量纯净两因子交互效应的2IV^m-p设计．     

BOUND ON THE MAXIMUM NUMBER OF CLEAR TWO-FACTOR INTERACTIONS FOR 2n-(n-k) DESIGNS

Clear effects criterion is an important criterion for selecting fractional factorial designs [1]. Tang et al. [2] derived upper and lower bounds on the maximum number of clear two-factor interactions (2fi's) in 2n-(n-k) designs of resolution Ⅲ and Ⅳ by constructing 2n-(n-k) designs. But the method in [2] does not perform well sometimes when the resolution is III. This article modifies the construction method for 2n-(n-k) designs of resolution Ⅲ in [2]. The modified method is a great improvement on that used in [2].     

Weak minimum aberration and maximum number of clear two-factor interactions in $$2_{IV}^{m - p} $$ designs

Both the clear effects and minimum aberration criteria are the important rules for the design selection. In this paper, it is proved that some designs have weak minimum aberration, by considering the number of clear two-factor interactions in the designs. And some conditions are provided, under which a design can have the maximum number of clear two-factor interactions and weak minimum aberration at the same time. Some weak minimum aberration designs are provided for illustrations and two nonisomorphic weak minimum aberration designs are constructed at the end of this paper.     

Weak minimum aberration and maximum number of clear two-factor interactions in 2_(IV)~(m-p) designs

Both the clear effects and minimum aberration criteria are the important rules for the design selection. In this paper, it is proved that some 2IVm-p designs have weak minimum aberration, by considering the number of clear two-factor interactions in the designs. And some conditions are provided, under which a 2IVm-p design can have the maximum number of clear two-factor interactions and weak minimum aberration at the same time. Some weak minimum aberration 2IVm-p designs are provided for illustrations and two non-isomorphic weak minimum aberration 2IV13-6 designs are constructed at the end of this paper.     

Weak minimum aberration and maximum number of clear two-factor interactions in 2m-p Ⅳ designs

Both the clear effects and minimum aberration criteria are the important rules for the design selection. In this paper, it is proved that some 2m-p Ⅳ designs have weak minimum aberration, by considering the number of clear two-factor interactions in the designs.And some conditions are provided, under which a 2m-p Ⅳ design can have the maximum number of clear two-factor interactions and weak minimum aberration at the same time.Some weak minimum aberration 2m-p Ⅳ designs are provided for illustrations and two nonisomorphic weak minimum aberration 213-6 Ⅳ designs are constructed at the end of this paper.     

A NOTE ON 2IVm-p DESIGNS WITH THE MAXIMUM NUMBER OF CLEAR TWO-FACTOR INTERACTIONS

In this article, the authors obtain some theoretical results for 2_IV^m-p designsto have the maximum number of clear two-factor interactions by considering the number of two-factor interactions that are not clear. Several 2_IV^m-p designs with the maximum number of clear two-factor interactions, judged using these results, are provided for illustration.     

不平衡两因素套设计模型中方差分量比的区间估计

给出了次样本容量相等时,不平衡两因素套设计模型中方差分量之比的广义区间估计.为了研究所得区间估计的优良性,并与Burdick,Birch and Graybill给出的修正大样本(MLS)方法进行对比,进行了模拟研究和分析.结果表明所得方法优于MLS方法,特别是在极端不平衡情形.