better try it this way:
DF <- data.frame(y = rnorm(100), x = rchisq(100, df = 3))
m <- lm(y ~ x, DF)
predict(m, data.frame(x = seq(-13, 13, 0.5)))
I hope it helps.
Best,
Dimitris
On 8/16/2010 2:37 PM, Trafim Vanishek wrote:
Dear all,
I have an error in the simple prediction function for lm().
Maybe someone experienced the same?
xma<- matrix(data = 0, nrow = 100, ncol = 2)
xma[, 1]<- rnorm(100)
xma[, 2]<- rchisq(100, df = 3)
m1<- lm(xma[, 1] ~ xma[, 2])
predict(m1, as.data.frame(seq(-13, 13, 0.5)))
Thanks a lot,
Trafim
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Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center
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