"David Barron" <[EMAIL PROTECTED]> writes:
> Is this what you want?
>
> lm(y ~ fd + fd:y)
Thanks for you fast reply. But it's not what I wanted.
To make it clearer I have to correct the first part of what I wrote:
> On 29/11/06, Andreas Goesele <[EMAIL PROTECTED]> wrote:
>> I would like to estimate something like y = a + b*d2*y + c*d3*y
>> where the dummies are created from some vector d with three
>> (actually many more) levels using factor(). But either there is
>> included the variable y or d1*y. How could I get rid of these?
This should have been something like:
x = a + b1*d2 + b2*d3 + c1*d2*y + c1*d3*y
When I change your suggestion to lm(x ~ fd + fd:y) I get the same as
for lm(x ~ fd*y - y), namely:
Coefficients:
(Intercept) fd2 fd3 fd1:y fd2:y fd3:y
2.4231 9.5769 6.1822 -0.1154 -1.0000 -0.4474
What I want is:
Coefficients:
(Intercept) fd2 fd3 fd2:y fd3:y
Thanks a lot again!
Andreas Goesele
--
Andreas Gösele Omnis enim res, quae dando non deficit,
Inst. f. Gesellschaftspolitik dum habetur et non datur,
Kaulbachstr. 31a, 80539 München nondum habetur, quomodo habenda est.
E-mail: [EMAIL PROTECTED] (Augustinus)
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