Hello Hugo,
Thank you for your reply.
This is a snap shot of what my data looks like:
Presencebsence
Habitatype
Substratetype
Width
Banktype
BankIncline
Bankheight
Waterdepth
0
Lake
Rocksgravel
600
Earth
0.45
less1
greater2
0
Lake
Rocksgravel
600
Earth
0.45
less1
greater2
1
Lake
Rocksgravel
600
Earth
0.45
less1
greater2
0
Lake
Rocksgravel
600
Earth
0.45
less1
greater2
0
Lake
Rocksgravel
600
Earth
0.45
less1
greater2
0
Stream
Rocksgravel
1
Rocks
0.45
less1
025to05
0
Stream
Rocksgravel
1
Rocks
0.45
less1
025to05
0
Stream
Rocksgravel
1
Rocks
0.45
less1
025to05
0
Stream
Rocksgravel
1
Rocks
0.45
less1
025to05
I am trying to find out if any off the above factors so substrate type, width,
bank type etc have an effect on the presence/absence of the species in
question. But as stated below I keep getting an error message up and I have no
idea how to fix it in order for me to fun the lmer.
Sophie
> From: hugo.mildenber...@web.de
> To: r-help@r-project.org
> CC: england...@hotmail.com
> Subject: Re: [R] Help with lmer
> Date: Fri, 24 Jun 2011 17:19:00 +0200
>
> Sophie,
>
> I'm myself quite new to linear mixed effect models, but "PresenceAbsence"
> sounds like
> a binary response variable. So wouldn't be
>
> m1<-lmer(Presencebsence~Habitatype*Width+(1|Sitename),familiy=binomial)
>
> the first thing to try? There is also a special mailing list for linear -
> mixed -effect
> models:
>
> r-sig-mixed-mod...@r-project.org
>
> But with numeric problems like this one you really should provide a self
> contained
> example (i.e. with data), at least the output of str(yourdata), if ever
> possible.
>
> Kind regards
>
> Hugo
>
> On Friday 24 June 2011 13:11:23 Sophie Higgins wrote:
> >
> > Hey,
> > I am having trouble with lmer. I am looking at the presence/absence of
> > water shrews against habitat and other factors e.g
> > so I used this:
> > m1<-lmer(Presencebsence~Habitatype*Width+(1|Sitename))summary(m1)
> > But i keep getting this error up
> > Error in mer_finalize(ans) : Downdated X'X is not positive definite, 16.>
> > summary(m1)Error in asMethod(object) : matrix is not symmetric [1,2]
> > What does this mean and now can I fix it?
> > Sophie
> > [[alternative HTML version deleted]]
> >
> > __
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
[[alternative HTML version deleted]]
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R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.