Thankyoy very much Ken and Thierry. I'll try that. Is there any specific
function for making graphs of the model? I appreciate recommendations or
citations to explore how to graph model results. Thanks again. Joaquin
El 10/08/2015 07:36, "Ken Beath" <ken.beath at mq.edu.au> escribi?:
There is actually a continuous third order interaction, which are just
about impossible to interpret.
As well as the graphs, which you always should start with, think about
what is sensible for the model. Should any of the predictors be
As AMGP is a count it wouldn't be surprising it it is, or use log(1+x)
there are zeroes.
Look at diagnostic plots and make sure that everything is fine,
that there are no outliers which might be causing the interaction.
Ken
On 10 August 2015 at 17:02, Thierry Onkelinx <thierry.onkelinx at inbo.be>
wrote:
Dear Joaquin,
Your mail is mangled because you send it in HTML. This makes the model
output very hard to read.
It's impossible to interpret model output without thorough knowledge of
the
dataset. I suggest that you try to make some graphs of the model.
Best regards,
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
Forest
team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
Kliniekstraat 25
1070 Anderlecht
Belgium
To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say
what the experiment died of. ~ Sir Ronald Aylmer Fisher
The plural of anecdote is not data. ~ Roger Brinner
The combination of some data and an aching desire for an answer does
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey
2015-08-07 21:27 GMT+02:00 Joaqu?n Aldabe <joaquin.aldabe at gmail.com>:
Hi all, I?m running a mixed model with poisson error distribution as
count data of a shorebird species. My predictors are AMGP (another
shorebird that is usually associated to "my" species and probably has
ecological influence on it), grass height and field distance to the
I?m having a hard time trying to interpret second order
appreciate your comments of references recommendations. Here is the
of my model. All the best, Joaqu?n.
Call:glmmadmb(formula = BBSA ~ AMGP * Grass_height *
Distance_to_lagoon + (1 | Field_name) +
offset(log(Field_area.o)),
data = my4S, family = "nbinom1", zeroInflation = TRUE)
AIC: 226
Coefficients: Estimate Std. Error
z value Pr(>|z|) (Intercept) -5.8797
1.2250 -4.80 1.6e-06 ***AMGP
3.3086 1.0246 3.23 0.0012 ** Grass_height
-4.1592 1.9961 -2.08 0.0372 * Distance_to_lagoon
-0.5029 1.3929 -0.36 0.7180 AMGP:Grass_height
2.9442 1.5142 1.94 0.0518 .
AMGP:Distance_to_lagoon -2.4695 0.9632 -2.56
0.0104 * Grass_height:Distance_to_lagoon 0.0339 2.0065
0.02 0.9865 AMGP:Grass_height:Distance_to_lagoon -4.0363
1.3264 -3.04 0.0023 ** ---Signif. codes: 0 ?***? 0.001 ?**? 0.01
?*? 0.05 ?.? 0.1 ? ? 1
Number of observations: total=64, Field_name=16 Random effect
variance(s):Group=Field_name Variance StdDev(Intercept)
0.03721 0.1929
Negative binomial dispersion parameter: 20.633 (std. err.:
7.4042)Zero-inflation: 1e-06 (std. err.: 6.8336e-09 )
Log-likelihood: -102
--
*Joaqu?n Aldabe*
*Grupo Biodiversidad, Ambiente y Sociedad*
Centro Universitario de la Regi?n Este, Universidad de la Rep?blica
Ruta 15 (y Ruta 9), Km 28.500, Departamento de Rocha
*Departamento de Conservaci?n*
Aves Uruguay
BirdLife International
Canelones 1164, Montevideo
https://sites.google.com/site/joaquin.aldabe
<https://sites.google.com/site/perfilprofesionaljoaquinaldabe>
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