[R] r: lm question

[Roger Bivand]

On Mon, 5 Jan 2004, allan clark wrote:

> Hi all
> 
> this is a silly question since i should know the answer.
> 
> lm(y~x) perfroms linear regression with the intercept included.
> 
> How  do i estimate the equation without the intercept?

?formula:

"The '-' operator removes the specified terms, so that '(a+b+c)^2 - a:b'
is identical to 'a + b + c + b:c + a:c'.  It can also used to remove the
intercept term: 'y~x - 1' is a line through the origin.  A model with no
intercept can be also specified as 'y~x + 0' or '0 + y~x'."

Roger

> 
> cheers
> 
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-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Breiviksveien 40, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 93 93
e-mail: Roger.Bivand at nhh.no