[18633] in s-news-athena
[S] remove intercept term using gam()
daemon@ATHENA.MIT.EDU (Matthias Richard)
Thu Jul 15 07:32:42 1999
Date: Thu, 15 Jul 1999 13:18:11 +0200 (MET DST)
From: Matthias Richard <richard@Psyres-Stuttgart.DE>
Reply-To: Matthias Richard <richard@Psyres-Stuttgart.DE>
To: s-news@wubios.wustl.edu
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Hello everybody!
I would like to fit a gam()-model WITHOUT the intercept term. I tried to
do it with -1 at the end of the formular, but it does not work.
e.g.
object1<-gam(EVENT ~
SP1INT + s(SP1MON) +
SP2INT + s(SP2MON) +
SP3INT + s(SP3MON) -1,
family=binomial, data=multspel)
this is a multiple spell discrete time survival analysis and I am trying
to fit a different smoothed hazard function to each spell. So each spell
has it's own intercept - but I cannot remove the overall intercept term!
Fitting a model with and without (like above) intercept yields exactly the
same results!!
Do I do something wrong here? Is there a way to remove the intercept from
gam()-models?
any comment is appreciated!
thanks a lot,
----------------------------------------
Matthias Richard (doctoral candidate)
Center for Research on Psychotherapy
Christian-Belser-Str. 79a
70593 Suttgart
Germany
email: richard@psyres-stuttgart.de
telephone: ++49-711-6781-408
http://www.psyres-stuttgart.de
COST Action B6:
'Efficient Psychotherapy of Eating Disorders'
(COoperation of Science and Technology in the European Union)
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