A critical note on the exponentiated EWMA chart

Abdul Haq () and William H. Woodall
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Abdul Haq: Quaid-i-Azam University
William H. Woodall: Virginia Tech

Statistical Papers, 2024, vol. 65, issue 8, No 23, 5379-5387

Abstract: Abstract In this short note, we reevaluate the run-length performance of the EWMA and exponentiated EWMA (Exp-EWMA) charts using the conditional expected delay metric. It is found that the enhancements offered by the Exp-EWMA chart over the EWMA chart in the zero-state setup are marginal. Given its simplicity in implementation and its ability to encompass the functionality of the Exp-EWMA chart in detecting delayed shifts in the process mean, the EWMA chart remains the preferred choice over the Exp-EWMA chart.

Keywords: Average run-length; Conditional expected delay; EWMA chart; Monte Carlo simulation; Zero-state and steady-state (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1007/s00362-024-01601-w

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