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- Title
An enhanced EWMA chart with variable sampling interval scheme for monitoring the exponential process with estimated parameter.
- Authors
Bai, Yajie; Chiang, Jyun-You; Liu, Wen; Mou, Zhengcheng
- Abstract
Control charts have been used to monitor product manufacturing processes for decades. The exponential distribution is commonly used to fit data in research related to healthcare and product lifetime. This study proposes an exponentially weighted moving average control chart with a variable sampling interval scheme to monitor the exponential process, denoted as a VSIEWMA-exp chart. The performance measures are investigated using the Markov chain method. In addition, an algorithm to obtain the optimal parameters of the model is proposed. We compared the proposed control chart with other competitors, and the results showed that our proposed method outperformed other competitors. Finally, an illustrative example with the data concerning urinary tract infections is presented.
- Subjects
QUALITY control charts; DISTRIBUTION (Probability theory); URINARY tract infections; MARKOV processes; MOVING average process
- Publication
Scientific Reports, 2024, Vol 14, Issue 1, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/s41598-024-58675-7