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diamevdettol
2011 Mar 14
0
Non-constancy of variances in mixed model.
.... I've done qqPlots()
and normality tests on my data, according to shapiro.test() on both my
subsets (I split the data into the two groups):
> shapiro.test(DiamEVDettol)
Shapiro-Wilk normality test
data: DiamEVDettol
W = 0.9823, p-value = 0.0221
> shapiro.test(DiamNEDettol)
Shapiro-Wilk normality test
data: DiamNEDettol
W = 0.9788, p-value = 0.007677
> qqPlot(DiamEVDettol, dist="norm")
> qqPlot(DiamNEDettol, dist="norm")
Which from the R-Book shows non-normality. qqPlot() I did show a slight
S shape, and then sligh...