نوع مقاله : مقاله پژوهشی
نویسندگان
گروه آمار، دانشکده علوم پایه، دانشگاه عالمه طباطبائی، تهران، ایران.
کلیدواژهها
عنوان مقاله English
نویسندگان English
In many control charts, the assumption of normality is a fundamental premise. However, in real-world applications, this assumption is often violated, leading to reduced efficiency in parametric control charts. When process data follow an unknown or non-normal distribution, parametric methods may yield unreliable results, making nonparametric control charts a more effective alternative. Among these, the sign control chart is a widely used technique for monitoring the location parameter of a process without requiring distributional assumptions. This study focuses on the economic design of the sign control chart in the presence of multiple independent assignable causes. A modified cost model, adapted from Duncan’s economic model, is developed to optimize the chart’s parameters. The analysis balances inspection costs and process performance to determine the most cost-effective monitoring strategy. Results indicate that the proposed model significantly enhances economic efficiency and detection performance under non-normal data conditions, making it a valuable tool for practical applications.
کلیدواژهها English