Estimations of Measurement System Variability and PTR under Non-normal Measurement Error

Chang, Mu-Seong; Kim, Sang-Boo

Journal of Korean Society for Quality Management > Volume 35(1); 2007 > Article

Journal of Korean Society for Quality Management 2007;35(1): 10-.

비정규 측정오차의 경우 측정시스템 변동과 PTR 추정

장무성, 김상부

창원대학교 산업시스템공학과

Estimations of Measurement System Variability and PTR under Non-normal Measurement Error

Mu-Seong Chang, Sang-Boo Kim

Department of Industrial and Systems Engineering, Changwon National University

ABSTRACT

ANOVA is widely, used for measurement system analysis. It assumes that the measurement error is normally distributed, which nay not be seen in some industrial cases. In this study the estimates of the measurement system variability and PTR (precision-to-tolerance ratio) are obtained by using weighted standard deviation for the case where the measurement error is non-normally distributed. The Standard Bootstrap method is used foy estimating confidence intervals of measurement system variability and PTR. The point and confidence interval estimates for the cases with normally distributed measurement error are compared to those with non-normally distributed measurement errors through computer simulation.

Key Words: Nonnormal Measurement Error;Measurement System Analysis;Precision-to-tolerance Ratio;