Abstract
AbstractZero‐inflated Poisson (ZIP) model is very useful in high‐yield processes where an excessive number of zero observations exist. This model can be viewed as an extension of the standard Poisson distribution. In this paper, a one‐sided generally weighted moving average (GWMA) control chart is proposed for monitoring upward shifts in the two parameters of a ZIP process (regarded as ZIP‐GWMA chart). The design parameters of the proposed chart are provided, and through a simulation study, it is shown that the ZIP‐GWMA performs better than the existing control charts under shifts in both parameters. Moreover, an illustrative example is presented to display the application of the proposed chart on practitioners.
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