hi, my name is giuseppe and i am an engineer, i am using R for regressions analysis using mixed random effects model, funztion "nlme". quastions are: 1) when i ask for the summary after a regression using nlme function the program gives me the values of the coefficients and also the standard deviation of the random effect but if i ask for the function sd(random.effects(model)) the value is different, why? 2) which is the real meanings of the function "residuals" in the nlme function ? (analitically) 3) have you got any suggestion about books or papers about nlme function in R ? thanks in advance Giuseppe
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