The paper reports a robust parameter design experiment, where we have used Taguchi's product array and a combined array simultaneously. This was done as part of a research project dealing with experimental design to optimise the process of sheet metal spinning. We found that the classical...

Recently, instead of transforming responses for the analysis of designed experiments, i. e. Taguchi-type-experiments like product or combined arrays, generalized linear models as suggested by Nelder and Lee (1991) have been used to jointly model the mean and dispersion of the response. For...

This paper discusses whether differences in the data structure of observational and experimental studies should lead to different strategies for variable selection. On the one hand, it is argued that outliers in the predictor variables have to be treated differently in the two kinds of studies....