Orthogonal block designs for Scheffé's quadratic model in three and four components have been considered by John (Technical Report 8, Centre for Statistical Sciences, University of Texas, Austin, TX, pp. 1-17), Czitrom (Comm. Statist. Theory Methods 17 (1988) 105; Comm. Statist. Theory Methods 18...

Traditionally Plackett and Burman [1946, The design of optimum multifactorial experiments. Biometrika 33, 305-325] designs have been used for screening main effects only because of their complex aliasing patterns. Recently, Wang and Wu [1995, A hidden projection property of Plackett-Burman...

Mclean and Anderson (1966), Snee (1975) and Nigam et al. (1983) have used symmetric factorials for constructing designs for fitting the quadratic mixture models, when the mixture components are constrained by upper and lower bounds. In this paper, we have used asymmetrical factorial plans for...

In residual treatment effects designs the effect of the treatment continues beyond the period of its application. Recently, Chawla and Dey (J. Indian Soc. Agric. Statist. 51(1) (1998) 42-50) have developed a series of balanced ternary change-over designs in which a treatment occurs in a given...

Taguchi introduced the concept of split-unit design to sort factors into different groups with respect to difficulties involved in changing the levels of factors. Li et al. have developed all possible group structures for eight factors in an L16 orthogonal array for resolution IV with split-plot...

Pigeon & Raghavarao (1987) introduced control balanced residual treatment effects designs for the situation where one treatment is a control or standard and is to be compared with the v test treatments, and they have also given methods of construction of control balanced residual treatment...