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
Tel: +41 79 359 83 32 (mobile)
Email: anne.piotet@m-td.com
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M-TD Modelling and Technology Development
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