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626 views

How to obtain predicted values from a gamm() using averaged coefficients (MuMIn)?

I want to extract the predicted values from a gamm() whose coefficients have been averaged using the package MuMIn, but I'm getting an error. ...
1
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0answers
137 views

model comparison of non-nested mixed-effects regressions fit to datasets of unequal sample size

My aim is to compare the performance of non-nested but closely related mixed-effects regression models fit to two datasets of different sample size. The data was obtained from behavioral experiments ...
1
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0answers
55 views

How can I compare two mixed models with the same variables but not the same relations between them

I have created two different models that include the same variables but not the same relations between them. ...
1
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0answers
306 views

How to compare AIC for mixed effects vs fixed effects

I have time series data for 80 individuals and I'm trying to fit a nonlinear ODE. I am comparing the result of doing the fit separately for each individual vs. doing a mixed effects model. My approach ...
1
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0answers
65 views

Inexplicable AIC/BIC growth from base model in SPSS 23 in a mixed model

I am running a mixed model with a binary dependent variable and a logit link using SPSS 23´s Generalized linear mixed model procedure. The data is multilevel (1 Subject, 5 questions/data points per ...
1
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1answer
51 views

Duplicate AICc values for multiple models with interactions

I am going through a model selection process with a mixed-model with 3 variables: A, B, and C. B and C are orthogonal factors. B or C may interact with A, so my full model would be: fixed: ...
1
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0answers
196 views

Mixed linear models with exactly the same AIC?

I have a dataset in which I measure the response variable of a number of individual animals. I used this response variable as the dependent variable in a linear mixed model, for which I have 5 ...
1
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0answers
686 views

Selection of lme models using AIC & appropriate random effects & variance structure

I am using three categorical predictor variables $X_1$, $X_2$, $X_3$ and one continuous dependent variable $Y$, and I want to treat $X_3$ as a random effect. The simplest model I could come with: <...
1
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0answers
281 views

Fitting an HLM model in lme4

I'm a fairly inexperienced statistician fighting a huge deadline and just need some peace of mind that I'm not making a massive error here. I'd be most grateful for pointers. I've been playing ...
0
votes
0answers
51 views

Model selection with AIC/BIC, which variables to remove?

I am running a Generalized Linear Mixed Model analysis in SPSS 25, and have gotten to the point where I would like to justify the selection of my final model based on information criteria. However, ...
0
votes
1answer
55 views

Why does AIC model rank order change in lme models with standardization of predictor variables?

I can't figure this out. The AIC/AICc rank of my mixed effect models are different whether or not I standardize my predictor values using rescale. Note, I'm not concerned that AICc is changing, as ...
0
votes
1answer
48 views

Can I compare AIC values for similar models fitted for two samples from the same population?

If I have two samples (n=300) from the same population and I'm fitting a GLMM (Generalised Linear Mixed-effects Model) with a similar response and explanatory variables but with a completely different ...
0
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0answers
94 views

Model selection for nested count data

What is the best tool-box for model selection when working with nested count data? Is AICc appropriate for comparing Poisson and negative binomial mixed models? Is there anything special to the ...