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Abstract
The process of designing orthogonal fractions of three level factorial experiments which will estimate the main effects is reviewed. Under an assumption of heterogeneous costs of observations, a cost model is proposed which allows the engineer to determine experimental costs directly from confounding scheme decisions without being required to develop the complete fraction first. This makes it possible to explore for the minimum cost fraction more efficiently. An example application to designing fractional experiments for calibrating state highway skid measurement equipment is given.