Hi Gavin,
> ... In this instance, you don't want to be working with lm. You can use
> lm.fit which returns an object with $coefficients, so I would guess you
> need something like this (not tested) ... & more ...
That's a great help, many thank's for walking me through it; that's the
stuff I ne
On Wed, 2007-12-12 at 06:46 -0800, Mark Difford wrote:
> Hi Gavin, Berwin,
>
> Thanks for your detailed replies. I'll make a general reply, if you don't
> mind.
>
> To reiterate, my main point is that if model.matrix() can be used in this
> way, then lm() shouldn't add an intercept.
>
> >> ...
Hi Gavin, Berwin,
Thanks for your detailed replies. I'll make a general reply, if you don't
mind.
To reiterate, my main point is that if model.matrix() can be used in this
way, then lm() shouldn't add an intercept.
>> ... lm(Gas ~ model.matrix(~ Insul/Temp - 1), data = whiteside)
And the
On Wed, 2007-12-12 at 02:05 -0800, Mark Difford wrote:
> Dear List-members,
>
> Hopefully someone will help through my confusion:
>
> In order to get the same coefficients as we get from the following
>
> ##
> require (MASS)
> summary ( lm(Gas ~ Insul/Temp - 1, data = whiteside) )
>
>
G'day Mark,
On Wed, 12 Dec 2007 02:05:54 -0800 (PST)
Mark Difford <[EMAIL PROTECTED]> wrote:
> In order to get the same coefficients as we get from the following
[...]
> we need to do the following (if we use model.matrix to specify the
> model)
By why would you want to do this?
> ##
> summary
Whoops! Sorry, forgot my session stuff, just in case ...
R version 2.6.1 RC (2007-11-22 r43520)
i386-pc-mingw32
locale:
LC_COLLATE=English_South Africa.1252;LC_CTYPE=English_South
Africa.1252;LC_MONETARY=English_South
Africa.1252;LC_NUMERIC=C;LC_TIME=English_South Africa.1252
attached base p
Dear List-members,
Hopefully someone will help through my confusion:
In order to get the same coefficients as we get from the following
##
require (MASS)
summary ( lm(Gas ~ Insul/Temp - 1, data = whiteside) )
..
we need to do the following (if we use model.matrix to specif
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