Ben Bolker wrote:
>
> plot(x,y,log="x")
> abline(r1)
> abline(r1,untf=TRUE,col=2)
> abline(r1,untf=FALSE,col=3) ## ??
> lines(x,predict(r1),col=4)
>
>
On second thought, I don't think this is a bug.
What "untf" is supposed to do is to transform what would
be a line in the original (untra
R Heberto Ghezzo, Dr wrote:
>
> Hello,
> if I do:
> x <- c(0.5,1,3,6,10,20,40)
> y <- 10-log(x)+rnorm(7,0,0.05)
> r1 <- lm(y ~ log(x))
> plot(log(x),y)
> abline(r1)
> #
> I get a nice plot with the regression line almost over the points.
> but:
> plot(x,y,log="x")
> abline(r1)
> g
o much for furthering knowledge and this discussion...
-Kevin
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of R Heberto Ghezzo, Dr
Sent: Thursday, November 01, 2007 1:40 PM
To: r-help@r-project.org
Subject: [R] problem with log axis
Hello,
if I do:
x <
Hello,
if I do:
x <- c(0.5,1,3,6,10,20,40)
y <- 10-log(x)+rnorm(7,0,0.05)
r1 <- lm(y ~ log(x))
plot(log(x),y)
abline(r1)
#
I get a nice plot with the regression line almost over the points.
but:
plot(x,y,log="x")
abline(r1)
gives me exactly the same plot for the points but the regress
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