Split-plot experiments with time trends in easy-to-change factors
by Mubashir Siddiqui, Kai Yang
International Journal of Quality Engineering and Technology (IJQET), Vol. 1, No. 3, 2010

Abstract: Split-plot experiments involve two types of factors, hard-to-change factors (HTC) and easy-to-change factors (ETC). In regular split-plot experiments, the experimental sequence of ETC factor levels should be randomised. However in many practical applications, the run sequence of ETC factors can only be changed in one direction. This restriction in the randomisation of ETC factors will create many serially correlated response observation subsequences, and regular analysis procedure will no longer be valid due to non independence of experimental residuals. In this paper, an integrated factorial and time series model is developed to analyse this kind of split-plot experiment with time trend in ETC factors.

Online publication date: Fri, 13-Aug-2010

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