On Some Mixed Order Response Surface Designs Useful in Sequential Experiments

Abstract

In this paper we have introduced some mixed order response surface designs like FORD­SORD, FORD­TORD, SORD­TORD and discussed their analysis and construction. We have also explained how we can improve upon a FORD­SORD where p factors are first order and ( v- p) factors are second order to get one in which p1 factors are first order, p2 factors are seeond order and other ( v - p) factors are second order so that the design becomes a FORD­GDSORD. We can then improve it further whenp, factors are first order and ( v- p+ p2) are second order.