[R] Forcing the intercept

[Leeds, Mark (IED)]

you can just subtract 4.3 from the independent variable and then do
through zero. That will
Give you a force through 4.3. I don't undersarand the second part of
your statement.



-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Heather Maughan
Sent: Monday, November 13, 2006 6:31 PM
To: r-help at stat.math.ethz.ch
Subject: [R] Forcing the intercept

Dear R-users:

I am doing multiple regressions using the "lm" function and would like
to force the intercept to be equal to a specific value (such as 4.3).  I
was able to find out how to force it through the origin but this does
not work for other values. 

I am also interested in forcing the regression parameters obtained from
one regression in another regression with a subset of the data.

Are either of these possible in R?  I have been searching the help guide
for hours and have been unsuccessful.

Many thanks,
Heather

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