Technical Note
Journal of the Operational Research Society (1993) 44, 711–716. doi:10.1057/jors.1993.120
Exponentially Weighted Moved Average (EWMA) with Irregular Updating Periods
F. R. Johnston
Warwick Business School, University of Warwick
Correspondence: F. R. Johnston, Warwick Business School, University of Warwick, Coventry CV4 7AL, UK.
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Abstract
This paper shows how to modify the smoothing constant for use in an Exponentially Weighted Moving Average system, when data has to be combined either across a number of periods, or is available from only a fraction of a normal forecast review interval.
Keywords:
Forecasting
