[R-sig-ME] interaction terms interpretation

[Thierry Onkelinx]

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 and
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 not
ensure that a reasonable answer can be extracted from a given body of data.
~ John Tukey

2015-08-07 21:27 GMT+02:00 Joaquín Aldabe <joaquin.aldabe op gmail.com>:

> Hi all, I´m running a mixed model with poisson error distribution as I have
> 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 lagoon.
>
> I´m having a hard time trying to interpret second order interactions. I
> appreciate your comments of references recommendations. Here is the output
> of my model. All the best, Joaquín.
>
> 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
>
>
> --
> *Joaquín Aldabe*
>
> *Grupo Biodiversidad, Ambiente y Sociedad*
> Centro Universitario de la Región Este, Universidad de la República
> Ruta 15 (y Ruta 9), Km 28.500, Departamento de Rocha
>
> *Departamento de Conservación*
> Aves Uruguay
> BirdLife International
> Canelones 1164, Montevideo
>
> https://sites.google.com/site/joaquin.aldabe
> <https://sites.google.com/site/perfilprofesionaljoaquinaldabe>
>
>         [[alternative HTML version deleted]]
>
> _______________________________________________
> R-sig-mixed-models op r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-sig-mixed-models
>

	[[alternative HTML version deleted]]