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The Exponentially Weighted Moving Variance

Summary: Exponentially weighted moving variance (EWMV) and exponentially weighted mean squared deviation (EWMS) charts are proposed as ways of monitoring various types of continuous process variation. They are particularly useful for augmenting control charts on individual observations where no estimate of variability is available from replicates and for providing measures of process variance when the observations are autocorrelated.

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  • Topics: Quality Control
  • Keywords: Autocorrelation,Variation,Quality control (QC)
  • Author: MacGregor, J.F.; Harris, T.J.
  • Journal: Journal of Quality Technology