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Which residuals - from gls or summary(gls) should I use?
In R, gls object contains "residuals" and the summary(gls) object contains residuals. Both differ from each other. Which is the one I should use for checking the normality?
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Estimating the residual variance by using a varFunc in nlme
I'm using a linear model to predict a dependent variable (the score to a test) starting by the age of a person. As shown in the figure below, the variability decreases when the age increases (data are ...
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