A process monitoring procedure based on a surrogate variable for dichotomous performance variable
Titel:
A process monitoring procedure based on a surrogate variable for dichotomous performance variable
Auteur:
Kwon, Hyuck-Moo Hong, Sung-Hoon Lee, Min-Koo Kim, Sang-Boo
Verschenen in:
IIE transactions
Paginering:
Jaargang 33 (2001) nr. 12 pagina's 1129-1133
Jaar:
2001-12-01
Inhoud:
A monitoring procedure using a surrogate variable is proposed for a process with a binary performance variable. Using the procedure, every item is inspected on a surrogate variable. When an item is rejected, the latest number of consecutively accepted items up to this point is compared with a predetermined number, r, to decide whether to stop the process for an investigation. The conditional distribution of the surrogate variable given the performance variable is assumed to be normal. A cost model is developed, which incorporates costs of inspection, misclassification, investigation, opportunity, and correction. We develop methods of finding the optimum r value and screening limit and analyze the effects of cost parameters on the optimal solution.