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List:       r-sig-mixed-models
Subject:    Re: [R-sig-ME] (no subject)
From:       Luca Borger <lborger () cebc ! cnrs ! fr>
Date:       2010-12-20 15:13:46
Message-ID: 4D0F72AA.5080901 () cebc ! cnrs ! fr
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Hello,

you should first search the archives, very often  similar questions have 
been asked in the past. E.g. see :

http://www.mail-archive.com/r-help@r-project.org/msg80092.html


 >I noticed that it appears most of the time when I try to include the 
(temperature^2).

Do you have enough data to estimate a quadratic effect?


HTH,

Cheers,

Luca


-------------------------------------------
Luca Borger
Postdoctoral Research Fellow
CNRS - Centre d'Etudes Biologiques de Chizé
Villiers-en-Bois
79360 Beauvoir-sur-Niort
France

Tel: +33 (0)549 09 96 13
Fax: +33 (0)549 09 65 26

email: lborger@cebc.cnrs.fr
http://www.researcherid.com/rid/C-6003-2008
-------------------------------------------


Le 20/12/2010 15:55, Marie-Hélène Hachey a écrit :
> Hi, I am running a model with lmer and I had this message from R (2.12)
> > Model<-lmer(freq ~ ln_age_rel + ppt_vis + gps_dec + tempsq + (1|espece/nestid), \
> > family=poisson)Messages d'avis :1: In mer_finalize(ans) :  Cholmod warning 'not \
> > positive definite' at file:../Cholesky/t_cholmod_rowfac.c, line 4322: In \
> > mer_finalize(ans) :  Cholmod warning 'not positive definite' at \
> > file:../Cholesky/t_cholmod_rowfac.c, line 4323: In mer_finalize(ans) : singular \
> > convergence (7)>  summary (Model)Erreur dans asMethod(object) : matrix is not \
> > symmetric [1,2]
> Can anyone give me a clue about what the message means?>  I noticed that it appears \
> most of the time when I try to include the (temperature^2). Thank you
> Marie-Helene 		 	   		
> 	[[alternative HTML version deleted]]
> 
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