Design of single sampling plans by variables indexed by Taguchi's quadratic loss function

Assume that the lot quality characteristics obey N(μ,σ²). Then, JIS Z 9004 is specified in the case of assuring the fraction defective. On the other hand, Taguchi has presented an approach to quality improvement in which reduction of derivation from the target value is the guiding principle. In this approach the lot quality is evaluated based on a quadratic loss form with respect to the difference between the measured value and the target value of product characteristics. This concept induces us to construct new variable sampling plans based on the Taguchi's quadratic loss function. In this paper, a design procedure of the sampling plans for assuring the loss in the Taguchi's method is proposed. Some numerical results based on the proposed design procedure are illustrated.