Suppose we start with

data("Titanic")
mosaic(Titanic, shade = TRUE)

How do I combine the dashed box contours of shading_Friendly to indicate negative residuals, with three levels of gray: dark for abs(Pearson Resid) > 4, lighter for 4 > abs(Pearson Resid) > 2, and lightest for bs(Pearson Resid) < 2 ?

Thanks,
Michael


______________________________________________
Professor Michael Kubovy
University of Virginia
Department of Psychology
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