[R] questions

[giuseppe scasserra]

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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