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23560
2000 Feb 24
2
(-1 as index) OR (envelope for QQ)
I'm new to R (and to S) and am wondering about code from pages 72 and
83 of MASS (Venables+Ripley, 3rd edition), to draw an envelope on a QQ
plot. Copying from the book, I've got:
#... code whose gist is "a.fit <- nls(..."
num.points <- length(resid(a.fit))
qqnorm(residuals(a.fit)) # illustrate data-model residuals
qqline(residuals(a.fit))
samp <-