Re: [R] predict problem

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From: Alan T. Arnholt (arnholt@math.appstate.edu)
Date: Tue 10 Apr 2001 - 00:08:37 EST 

Message-ID: <SIMEON.10104091037.C@WALKER231.math.appstate.edu>

You need to change "new <- data.frame(x=80)" to read
"new <- data.frame(lot=80)"

Alan

On Mon, 09 Apr 2001 15:43:13 +0200 Troels Ring
<tring@gvdnet.dk> wrote:

> Windows 98
> R : Copyright 2001, The R Development Core Team
> Version 1.2.1 (2001-01-15)
> Dear friends.
> How comes this works and produce a single prediction:
> x <- rnorm(15)
> y <- x + rnorm(15)
> predict(lm(y ~ x))
> new <- data.frame(x = seq(-3, 3, 0.5))
> predict(lm(y ~ x), new, se.fit = TRUE)
> pred.w.plim <- predict(lm(y ~ x), new, interval="confidence")
> new1 <- data.frame(x=3)
> predict(lm(y ~ x), new1, interval="confidence")
>
> while this refuses to take the "new" and predict ?
> lot <- c(30,20,60,80,40,50,60,30,70,60)
> hours <- c(73,50,128,170,87,108,135,69,148,132)
> z1 <- lm(hours~lot)
> new <- data.frame(x=80)
> predict(z1,new,interval="confidence",level=90)
> best wishes
> Troels
>
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----------------------
Alan T. Arnholt
arnholt@math.appstate.edu

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