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Questions tagged [glmm]

75 questions
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Are there various formulas generating generalized linear mixed-effects models(GLMM)in lme4 package?

I am reproducing a GLMM with the data given in a published paper. The author mentioned that lme4 package was used in the analysis. I am using glmer() and in summary(),I am able to get the correct AIC. However, the fixed effects(e.g. estimate, std.…
user22390084
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Fitting multivariate mixed model (mvglmer) with JMBayes - Error in x$terms : object of type 'symbol' is not subsettable

I am trying to do a mvglmer fit with jmbayes with the following snippet data of the first patient: ****id1 predx** 1011025 Prednisolone **wks ecgrate_binary ecgpri_binary** 0 1 0 …
Modiehi
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Inverse and log function get opposite results in GLMM - which one to pick?

I am trying to fit GLMM in R where we predict reaction times (RTs, dependent variable) by a continuous, uniformly distributed variable called scores (independent variable); the random effect is the participant (glmer(rt ~ scores + (1|participant)).…
user9361
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R Roc curve small sample with random effect with small groups

I have a dataset of 550 samples of Nests for which I know how many nestlings died or survived. I performed a binary proportion model: cbind(died,survived)~ variable 1+variable2+(1|Colony/Nest_ID),family=binomial) I would like to estimate the fit of…
Norpantytär
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Model convergence problem; non-positive-definite Hessian matrix. See vignette('troubleshooting') - problem trying to calculate R2

I'm trying to fit a glmm using the package glmmTMB in R. The model has a Poisson distribution: mod_po <- glmmTMB(richness ~ x_dif + x_dif2 + (1|papers/watersheds), data = df_glm, family = poisson). The variables x_dif and x_dif2 are stream sizes,…
nati_sb
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How do I get unscaled version of parameter for my interaction model on GLMM using plot_model?

I am looking at camera trap data to study drivers of illegal human activities in the central Vietnam. I made a GLMM model to see the impact of species number and remotessess on the number of human records at each camera trap stations. I used the…
Shyam Sharma
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How to calculate predicted values using glmmTMB?

I'm trying to check if bees differing in size can affect pollen deposition over 20 sequential visits. As a response variable, I have the number of pollen grains; as predictors, I have the sequence of 20 flowers. Because the amount of pollen received…
Amanda Vieira
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How(what) to plot (for) results of negative binomial glmm with categorical variables against counts?

I have count data for an ungulate species from two sites (here made up for the question). I want to know how to showcase results of categorical variable in this analysis. I first thought the graph I am getting have incidence rate ratios, but then…
Zaara Kidwai
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Best way to run a GLMM with max, min, and average of the same variables

I have a dataset consisting of "total activity" (a count variable, number of observations per day) and many predictor variables (temperature, humidity, etc.). I have the daily maximum, minimum, and average for each variable. I want to use a GLM or…
hutch
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Fixed-effects generalized linear model for multinomial data

I would like to find an equivalent fixed-effects model in R for the ordinal package model for analyzing multinomial data with threshold terms and a "probit" link function, such as: clmm(y ~ 1 + Bloco + (1| Trat), data=dados3a, link="probit") The…
Mateus Piza
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Power analysis: Model comparison with LRT in R

Any suggestions on how to best implement a power analysis in R when having a binomial generalized linear mixed model (glmm) with 2 categorical predictors as fixed effects (2 levels and 8 factor levels) and testing hypotheses through model comparison…
Sahila
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Singular Fit for Random Effect in Binomial GLMM

At my wits end running models and would greatly appreciate help. I am currently running GLMM's to understand the relationships between a set of predictor variables (continuous data) and my binomial outcome variable (0,1 - 'self_reported_conflict).…
candidcorvid
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Confidence intervals for predictions from logistic regression GLMER

I am trying to make a prediction model and I would like to have the confidence intervals around these predictions This is a mixed generalized logistic regression model I tried to take the code here : Confidence intervals for predictions from…
Camille Revertégat
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Problem with dredge function in MuMIn "result is empty" and "missing values in object" despite dataset seeming to be complete

I get the following error message when I run the dredge function : Fixed term is "(Intercept)" Error in dredge(global.model = ChangeModel, evaluate = TRUE, rank = "AICc") : result is empty In addition: There were 50 or more warnings (use…
PowellHall
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"Error in KhatriRao(sm, t(mm)) : (p <- ncol(X)) == ncol(Y) is not TRUE" in glmer even after previous solutions answers tried

I know a question with this exact same question has been asked previously, but previous answers have come up with two possible answers, neither of which I think is applicable in this case. In the first one, there were NA values, and I have already…
PowellHall
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