SHEWHART CONTROL CHARTS TO DETECT MEAN AND STANDARD DEVIATION SHIFTS BASED ON GROUPED DATA
نویسندگان
چکیده
منابع مشابه
Shewhart Control Charts to Detect Mean and Standard Deviation Shifts Based on Grouped Data
We propose a Shewhart control chart based on gauging theoretically continuous observations into multiple groups. This chart is designed to monitor the process mean and standard deviation for deviations from stability. By assuming an underlying normal distribution, we derive the optimal grouping criteria that maximizes the expected statistical information available in a sample. Control charts ba...
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The influence of the estimation of parameters in Shewhart control charts is investigated. It is shown by simulation and asymptotics that (very) large sample sizes are needed to accurately determine control charts if estimators are plugged in. Correction terms are developed to get accurate control limits for common sample sizes in the in-control situation. Simulation and theory show that the new...
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Control charts are widely used in industrial processes as well as in health sciences and particularly for monitoring the performance of cardiac surgeon or a group of surgeons based on the preoperative risk of patients. Since the preoperative risk is a vague and nonprecise variable and the anesthesiologists after checking how many risk factors a patient has, determine the risk of mortality befor...
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Tsuyoshi Isojima1, 2, Noriko Kato3, Yoshiya Ito1, 4, Susumu Kanzaki1, 5, and Mitsunori Murata1, 6 1 The Japanese Society for Pediatric Endocrinology, Kyoto, Japan 2 Department of Pediatrics, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan 3 Department of Early Childhood and Elementary Education, Jumonji University, Niiza, Japan 4 Faculty of Nursing, Japanese Red Cross Hokkaid...
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ژورنال
عنوان ژورنال: Quality and Reliability Engineering International
سال: 1996
ISSN: 0748-8017,1099-1638
DOI: 10.1002/(sici)1099-1638(199609)12:5<345::aid-qre11>3.0.co;2-m