From: <vincent_at_7d4.com>

Date: Mon 10 Oct 2005 - 23:48:53 EST

*>
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*> No!
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R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Mon Oct 10 23:53:07 2005

Date: Mon 10 Oct 2005 - 23:48:53 EST

>> Domenico Cozzetto a écrit : >> >>> Dear all, >>> I'd like to get a linear regression of some data, and impose that the >>> line >>> goes through a given point P. I've tried to use the lm() method in the >>> package "stats", but I wasn't able to specify the coordinates of the >>> point P. Maybe I should use another method? >> >> add directly P in your data is also a way

> Please, both of you, consult a basic textbook on linear regression.

If you have a good reference or link in mind, I would thank you.

> You can transform the data (linear) so that P becomes (0,0), after that

*> you can estimate the slope without intercept by specifying
**> lm(y ~ x - 1)
**> The slope estimate is still valid while your intercept can be calculated
**> afterwards.
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Sorry for my lack of knowledge, but will the above trick really force
the regression line to pass through P ?

adding (0,0) in this new system of coordinates isn't it equivalent to
add P to the dataset in the original system ?

If my question is too basic and/or too stupid, just give it a rest.

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

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Mon Oct 10 23:53:07 2005

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