VARIABLE SAMPLING PLANS FOR NORMAL-DISTRIBUTION INDEXED BY TAGUCHIS LOSS FUNCTION

Taguchi has presented an approach to quality improvement in which redu ction of deviation from the target value is the guiding principle. In this approach any measured value x of a product characteristic X bring s a loss to consumer in general, where the loss is expressed as a quad ratic form with respect to the difference between the measured value x and the target value T of a product characteristic. Then, it is natur al to reject the lot which may bring a large loss to consumer. This co ncept induces us to construct new variable sampling plans based on the Taguchi's loss criterion. In this article, a design procedure of the sampling plans for assuring the loss in the Taguchi's method is propos ed. Some numerical results based on the proposed design procedures are illustrated. (C) 1997 John Wiley & Sons, Inc.