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This note introduces a new Bayesian control chart to compare two processes bymonitoring the ratio of their percentiles under Weibull assumption. Bothin-control and out-of-control parameters are supposed unknown. The chartanalyses the sampling data directly, instead of transforming them in order tocomply with the usual normality assumption, as most charts do. The chart usesthe whole accumulated knowledge, resulting from the current and all the pastsamples, to monitor the current value of the ratio. Two real applications inthe wood industry and in the concrete industry give a first picture of thefeatures of the chart.

A note on monitoring ratios of two Weibull percentiles