Displaying 3 results from an estimated 3 matches for "vandegehuchte".
2008 Feb 14
1
Cholmod error `matrix not positive definite'
...ust crashes completely.
This is a mystery to me, especially because the variables totmas or vitality don't give any problem when I build the exact same models in SAS with proc glimmix...
Does someone have experience with this type of problem?
Thank you in advance,
Martijn.
--
Martijn Vandegehuchte
Ghent University
Department Biology
Terrestrial Ecology Unit
K.L.Ledeganckstraat 35
B-9000 Ghent
telephone: +32 (0)9/264 50 84
e-mail: martijn.vandegehuchte@ugent.be
website TEREC: www.ecology.ugent.be/terec
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2008 Feb 20
1
p-value for fixed effect in generalized linear mixed model
...uot;spikes" of 0,985. So if "spikes" is not having a significant effect on "aphids", then why the above mentionned p-value generated by anova in R?
Can anyone explain this?
Please find the dataset in the attachment.
Many thanks beforehand,
Martijn.
--
Martijn Vandegehuchte
Ghent University
Department Biology
Terrestrial Ecology Unit
K.L.Ledeganckstraat 35
B-9000 Ghent
telephone: +32 (0)9/264 50 84
e-mail: martijn.vandegehuchte at ugent.be
website TEREC: www.ecology.ugent.be/terec
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2012 Feb 21
0
mvabund package: errors using manyglm() and meanvar.plot()
Dear R users,
I am trying to analyze multivariate abundance data using the mvabund
package, but errors occur for several functions.
I created a mvabund object named faunadat consisting of 8 dependent
variables each containing 64 positive integer values (bact, fung, plant,
omn, pred, orib, meso, spring). There are 4 factors: harv, rep, depth and
lit.
I then created a formula:
>