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Author

Y. Areepong

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Open access Oct 2026

Sensitivity Analysis for Identifying Parameter Changes in Attribute Data Utilizing Modified EWMA with Improved Square Root Transformation

The original Shewhart p- and c-charts monitor binomial and Poisson attribute data using normal-approximation control limits, which may be unreliable for small or moderate samples, low defect levels, or sparse nonconformities. This study proposes Improved Square Root Transformation-based modified exponentially weighted...

S. Phantu, Y. Areepong, S. Sukparungsee · 0 citations
Open access Aug 2026

Analytical design of ARL based on a modified EWMA control chart under ARIMA processes

In statistical process control, the performance of control charts is commonly evaluated using the average run length (ARL), which represents the expected number of observations required to signal a change in the monitored process. In many practical applications, quality characteristics are observed as time series data,...

Piyatida Phanthuna, Y. Areepong · 0 citations

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