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Just a note

Notice how, on the QQ plots, values are distributed unevenly along the line - y1 being normal most of them are clustered in its mid-region. Because the sample sizes were relatively large (n=90) these theoretical quantiles are almost identical to the normal rankits.

PP values are distributed evenly along the line - and their deviations are opposite to those of the QQ plots. More importantly, notice that PP plots are rather less sensitive to deviations from normal.