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http://dx.doi.org/10.5351/KJAS.2006.19.1.081

A Control Chart Method Using Quartiles for Asymmetric Distributed Processes  

Park Sung-Hyun (Department of Statistics, Seoul National University)
Park Hee-Jin (Department of Statistics, Seoul National University)
Publication Information
The Korean Journal of Applied Statistics / v.19, no.1, 2006 , pp. 81-96 More about this Journal
Abstract
This paper proposes a simple control chart method which can be practically used for asymmetric process data where the distribution is unknown. If we use the Shewhart type control charts which are based on normality assumption for the asymmetric process data, the type I error could increase as the asymmetry increases and the effectiveness of control chart to control variation decreases. To solve such problems, this paper suggests to calculate the control limits based on the quartiles. If we obtain the control limits by such quartile method, the type I error could decrease and it looks much more practical for asymmetric distributed process data.
Keywords
Control chart; Asymmetric distribution; Quartile; Box plot; Type I error;
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