False Signal Rates for the Shewhart Control Chart with Supplementary Runs Tests
作者:
WalkerEsteban,
PhilpotJohn W.,
ClementJames,
期刊:
Journal of Quality Technology
(Taylor Available online 1991)
卷期:
Volume 23,
issue 3
页码: 247-252
ISSN:0022-4065
年代: 1991
DOI:10.1080/00224065.1991.11979330
出版商: Taylor&Francis
关键词: Runs Tests;Shewhart Control Chart;Statistical Process Control;Type I Error
数据来源: Taylor
摘要:
It is common practice to supplement the ShewhartX̄chart with so called“runs tests.”These tests are designed to give an earlier detection of anomalies in the process mean. Although these tests are valuable in detecting“true”problems, they also increase the probability of a false signal. In this paper the false signal rates of eight runs tests are obtained through simulation. In-control processes were generated using independent realizations of a standard normal distribution. The results show that the number of false signals can be fairly high, particularly when the number of tests applied and number of subgroups increase.
点击下载:
PDF (482KB)
返 回