hello to all!
I have a small problem wit predict() for lm
Let's say I have predictors x1 and x2, response y
I want to predict for a new ds say
dn<-data.frame(x1= seq(min(x1),max(x1),length=10),x2=rep(median(x2),10))
predict(lm(y~x1+x2),dn,se.fit=T)
Error message
> Error: variables 'x1', 'x2' were specified differently from the fit
(I looked in the help and found the example
x <- rnorm(15)
y <- x + rnorm(15)
new <- data.frame(x = seq(-3, 3, 0.5))
predict(lm(y ~ x), new, se.fit = TRUE)
where is the difference?)
Anne
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Anne Piotet
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Email: [EMAIL PROTECTED]
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M-TD Modelling and Technology Development
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