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Questions tagged [brms]

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brms is an R package interfacing stan for Bayesian analysis

91 questions
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1 vote
1 answer
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I am aware that a similar question has been asked here: Negative bayes factor and how to fix it but it was never answered. I have fitted some Bayesian models. Everything is looking normal, except for ...
kpv's user avatar
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0 votes
0 answers
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I have previously asked here regarding glmm models in R. I am new with brms and glmm models ...
LVC's user avatar
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3 votes
2 answers
160 views

I have been experimenting with brms over the past few days, and there is something I can’t quite figure out concerning the approach with logistic regression and log-odds to probability transformations....
Nee's user avatar
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1 vote
0 answers
52 views

I am estimating repeatability (a type of intra-class correlation) from mixed models with negative binomial and beta distributions and want to confirm that the variance transformations to obtain ...
alab's user avatar
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3 votes
1 answer
143 views

I'm interested in conducting a mediation analysis with ordinal outcomes, and have not been able to find too many resources. I apologize if I've missed any. My model contains: X --> M --> Y where ...
ahach's user avatar
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2 votes
1 answer
158 views

I design a vigniette experiment about social norms: There is a social-media post about reducing meat consumption which varies the actor (stranger, friend, relatie), the amount of the reduction (no ...
lilla's user avatar
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0 votes
0 answers
57 views

I’m working on a Bayesian ordinal regression model using brms to estimate coral bleaching severity levels (4 categories: None, Mild, Moderate, Severe) based on thermal stress. My data consists of two ...
Virginie Bornarel's user avatar
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4 votes
1 answer
121 views

I am investigating the properties of a GLMM with Beta response distribution and a hurdle component to model the probability of observing a zero. I have fit a frequentist version of the model using the ...
qdread's user avatar
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1 vote
1 answer
97 views

I am exploring relationships between physiological metrics (responses) and environmental conditions (predictors) in a wildlife species. The physiological metrics are "novel" for my study ...
CRO's user avatar
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0 votes
0 answers
90 views

I've attempted to use some stats which are definitely a bit beyond me as my most advanced stats before was just an ANOVA, but it seemed to fit my data well and am finding it fun to mess around with. ...
FredB's user avatar
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1 vote
1 answer
125 views

I am trying to determine whether the variation in a response differs between two treatment groups, I am curious what others think of my current strategy and I have some outstanding questions that I ...
twilightecologist's user avatar
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1 vote
1 answer
123 views

I try to add a fixed effect in a nonlinear binomial model with brms but I obtain weird result. The model is a kind of logistic model. The fit works fine when the effect is added as random effect but ...
MarcG's user avatar
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0 votes
0 answers
41 views

If I am interested in understanding the effect of an interaction between treatment and covariates on the variance of my response, as well as how they may affect the mean of my response, can I write a ...
twilightecologist's user avatar
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1 vote
1 answer
109 views

I want to fit a mixed model to determine a treatment's effect on a circular response variable (the variable is an angle measured in radians). I want to know how treatment changes both the mu (mean) ...
twilightecologist's user avatar
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1 vote
0 answers
70 views

I'm trying to model age-related trajectories (i.e., growth curves) of National Football League (NFL) players' fantasy points using a mixed model in R using ...
itpetersen's user avatar
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