Purpose – The purpose of this paper is to present the single sampling attribute plan for given acceptance quality level (AQL) and limiting quality level (LQL) involving minimum sum of risks using weighted Poisson distribution. Design/methodology/approach – For the given AQL and LQL, sum of...

Purpose – The purpose of this paper is to present the optimal double sampling attribute plan using the weighted Poisson distribution. Design/methodology/approach – For the given AQL and LQL, sum of producer’s and consumer’s risks have been attained. Based on the weighted Poisson...

Abstract This paper introduces modified producer's risk and consumer's risk in the case of chain sampling plans obtained by modelling the defective probability p not as a constant, but as a random variable that follows a beta distribution.

Abstract Average run length is the most popular measure to assess the statistical performance of a control chart procedure. This paper discusses the limitations of the traditional average run length measure and introduces the concept of ‘unity’ average run length which is the ratio of the...

Abstract A nonparametric sequential probability ratio test control chart to monitor the process dispersion based on the sequential sign statistic is proposed. The statistical performance of this chart is evaluated by comparing it with that of the charts for dispersion based on sign statistic in...