FRACTIONAL FACTORIAL DESIGNS THAT RESTRICT THE NUMBER OF TREATMENT COMBINATIONS FOR FACTOR SUBSETS

摘要

Designs are constructed that limit the number of treatment combinations within subsets of factors. Such designs came to our attention in the context of machine assembly experiments (by Diamond and Bisgard). For example, to improve a stepper motor, we plan a 2~4-1 design to investigate four rotor factors and a similar 2~4-1 design to investigate four stator factors. The product of these two arrays-to study the eight factors of these motors- would involve 64 combinations.