From: Douglas Bates <bates_at_stat.wisc.edu>

Date: Wed 21 Jul 2004 - 20:30:46 EST

R-help@stat.math.ethz.ch mailing list

https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Jul 21 21:02:21 2004

Date: Wed 21 Jul 2004 - 20:30:46 EST

>>>On Tue, 2004-07-20 at 17:02, Avril Coghlan wrote:

*>>>
**>>>
**>>>>Hello,
**>>>>
**>>>> I'm a newcomer to R so please
**>>>>forgive me if this is a silly question.
**>>>>
**>>>>It's that I have a linear regression:
**>>>>fm <- lm (x ~ y)
**>>>>and I want to test whether the
**>>>>slope of the regression is significantly
**>>>>less than 1. How can I do this in R?
*

Another way of doing this is to use offset(x) in the model formula

summary(fm <- lm(y ~ x + offset(x)))

(I know you wrote lm(x ~ y) but I find I have to think of it as lm(y ~ x) - old habits are hard to break.)

If you want to test for "slope is significantly less than 2" you would use

summary(fm <- lm(y ~ x + offset(2*x)))

R-help@stat.math.ethz.ch mailing list

https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Jul 21 21:02:21 2004

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