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Industrial Statistics with Minitab by Xavier Tort-Martorell Llabres, Lluis Marco Almagro, Pere Grima Cintas

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15.4 Capability Study for Variables that Follow a Poisson Distribution

Here, use the file OVEN_PAINTED.MTW since the number of defects per unit is a typical example of a variable that follows a Poisson distribution.

Stat > Quality Tools > Capability Analysis (Poisson)

nc15uf005.eps
nc15uf006.eps

The process remains stable at about 3 defects per unit. The graph of the cumulative average value indicates that the number of samples is sufficient. Additionally, the Poisson Plot suggests that the hypothesis that the data follows a Poisson distribution is perfectly reasonable.

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