On Jan 13, 2009, at 5:54 PM, Stefano Leonardi wrote:
David Winsemius wrote:
It would be so *if* you had estimated a saturated model, but you
did not. Your fit
of Y|A values is adjusted for the B values.
Thank you.
What do you exactly mean by "Y|A values is adjusted for the B values"?
Another way of expressing it ... the fit of Y|A in the A levels is a
weighted average of Y|A,B=0, Y|A,B=1, and Y|A,B=2.
And Yes. It works! Using the interaction I got what I expected as
intercept.
And, if you check, in all of the other possible combinations of A and B.
Thanks
Stefano
Try instead with lm(Y ~ A * B). You should get intercept (1), main
effects(1+2) and
interaction terms(2) which should total the number of groups.
Appropriately combined,
these estimates will now exactly fit the "raw values".
--
======================================================================
Stefano Leonardi
Dipartimento di Scienze Ambientali
Universita` di Parma E-mail: stefano.leona...@unipr.it
Viale Usberti 11/A Phone : +39-0521-905659
43100 PARMA (Italy) Fax : +39-0521-905402
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