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Questions tagged [gamm4]

R package to fit generalized additive mixed models (GAMM) using mgcv and lme4 packages.

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2answers
205 views

Gamm residuals patterns: temporal and spatial

I'm trying to fit a GAMM model with this dataset, which can be downloaded here: https://ufile.io/8umh6 . The dataset consists of 60 pixels sampled in two different areas: BAR and MON, 30 for each one. ...
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1answer
173 views

Getting better p-values for a gam model with multiple explanatory terms using bootstrapping

I'm running a GAMM in R on count data with multiple explanatory variables, including both continuous variables with smoothers and factors, a random effect, and a Poisson distribution using the gamm4 ...
6
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0answers
2k views

Interpreting and reporting gamm4 result

I am new to gam, and most of my knowledge comes from this document http://www3.nd.edu/~mclark19/learn/GAMS.pdf. Now I am using generalized addictive model with random effects to model some data, where ...
3
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0answers
2k views

How to calculate deviance explained for a general additive mixed model (GAMM)?

I am working with the package mgcv fitting some GAMs with several covariates, and the same models with GAMMs including annual correlation. Applying the ...
2
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0answers
45 views

GAMM with multiple and crossed random effects

I am new to Generalized additive mixed models (GAMM) and I'm trying to model a behavioral response variable (time spent shading eggs by a nesting bird in minutes ...
2
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0answers
237 views

Model Comparison of GAMs using gamm4

I am using a GAM from package gamm4 in R to fit a varying coefficient model for longitudinal data. I have data consisting of ...
2
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0answers
903 views

Help interpreting plot.gam in R (gamm4)

I'm not sure this question is better suited for Cross Validated or Stack Overflow, please don't hesitate to tell me if I ask it on the wrong forum. I'd appreciate some help interpreting what shows the ...
2
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0answers
1k views

Binomial Temporal GAMM does not converge (R::mgcv)

I am new to both mixed effect and Additive models so I'm sorry if the answer here is trivial. I have data collected on several metabolic chemicals (M1,M2...), covariates (time,Race,Gender...) and ...
1
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0answers
45 views

Determine maxima and minima of fitted GAMM smooth

I have been using gamm4 to model the daily activity pattern of a certain behavior as a binomial response (whether the behavior occurs or not for each hour of the day). I am comparing the daily ...
1
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0answers
88 views

R^2 for mixed effect models (both generalized linear and additive)

I have seen from several discussion threads that there are a few ways of calculating R^2 for LMMs and GLMMs - albeit with a caveat for GLMM being that the existing methods work for only gaussian ...
1
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0answers
1k views

Generalized additive mixed model in R - specifying a fit function

The data in question comprise two response groups (no response vs. stress signal), different individuals, repeated measures ...
1
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0answers
145 views

Can i use a mixture model for when I have an omitted variable?

I plan to fit a GAM or GAMM. There is one categorical variable which I think is important for explaining Y (or Y*), but it is not in my dataset - it is measurable but has not been measured. Can I use ...
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0answers
23 views

Using gamm4 on zero-inflated count data with Tweedie or zero-inflated Poisson distributions

I'm working with a dataset with a large number of zero-counts on the response variable. This dataset consists of qualitatively coded interviews in a number of important categories, but many of the ...
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0answers
26 views

gam/gamm when response variable is complex

I would like to fit a generalized additive mixed model using mgcv or gamm4, but have a response variable consisting of complex numbers where y=a+1i*b. Is this possible, and if so are there any special ...
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0answers
79 views

Correct way to account for repeated measures and spatial autocorrelation in GAMM (R)

I am using the gamm function in the mgcv package in R to specify a model that predicts abundance with respect to elevation and year based on repeated measures from several sites. My overarching ...