By studying treatment contrasts and ANOVA models, we propose a generalized minimum aberration criterion for comparing asymmetrical fractional factorial designs. The criterion is independent of the choice of treatment contrasts and thus model-free. It works for symmetrical and asymmetrical designs, regular and nonregular designs. In particular, it reduces to the minimum aberration criterion for ...

The effect of mycorrhiza fungi was studied on growth and yield of potato (Solanum tuberosum L.) in Fereidoonshahr, Esfahan, Iran during 2013 growing season. The experiment treatments were arranged in a factorial design based on a complete randomized block design with three replications. Four phosphorus fertilizer levels of 25%, 50% 75% and 100% P recommended with two levels of Mycorrhiza: with ...

The present study tested the factorial validity of the 9-item Bergen Burnout Inventory (BBI-9). The BBI-9 is comprised of three core dimensions: (1) exhaustion at work; (2) cynicism toward the meaning of work; and (3) sense of inadequacy at work. The study further investigated whether the three-factor structure of the BBI-9 remains the same across different organizations (group invariance) and ...

This paper addresses the problem of optimizing a factorial system with multiple responses. A heuristic termed probabilistic sequential methodology (PSM) is proposed. The PSMidenti® es those designs that maximize the likelihood of satisfying a given set of functional requirements. It is based on sequential experimentation, statistical inference and a probabilistic local search. The PSM comprises...

To prevent a premature failure, absorbable magnesium implants must possess an adequate mechanical stability. Among many ways to improve the properties of is by particle reinforcement, such as using carbon nanofiber (CNF). This work reports experimental design for optimum materials and processing CNF-reinforced Mg–Zn composites based on two-level factorial design. Four factors were analyzed: per...

in this study the effect of month, place and different years on the preferencevalue of bromus tomentellus in semi-steppe region was studied. the preferencevalue of the bromus tomentellus was studied in two years and four months in three sites as cheshme anjir (fars), badamstan (zanjan) firuzkuh (tehran). to determine the preferencevalue of species the two methods of as preference index and timi...