Questions tagged [r]
Use this tag for any *on-topic* question that (a) involves `R` either as a critical part of the question or expected answer, & (b) is not *just* about how to use `R`.
30,451 questions
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Goodness-of-fit metrics for latent class logit model using gmnl package
I’m estimating a latent class multinomial logit model in R using the gmnl package (model = "lc"). The model includes individual covariates in the class membership function.
I’ve already ...
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How to interpret output from a joint model in R?
I’m very new to joint models, and I could really use some help understanding what I’m doing and how to interpret the results.
I’m working with a longitudinal biomarker measured at 4 different time ...
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Test if two coefficients in a linear model are both significant
Is there a single test one can perform that would be significant if two coefficients in a linear model are both different from 0, but would not be significant if only one of them differs from 0? Yes ...
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Understanding `confint()` output
Context
From my understanding, when doing statistical inference, e.g., estimating the mean of a population from a sample, it is possible to use a linear regression. The intercept parameter is an ...
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Mixture-Based Clustering for Ordered Stereotype Model - Distance Scores
I have a 5-variable/3 category-level ordinal survey data set. E.g. 5 health variables ranked 1-3 (good-moderate-poor).
I want to row-cluster different responses. But also, I want determine whether ...
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poor parameter recovery in brms from simulated vigniette experiment
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 ...
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General advice for interpreting DHARMa quantile plots
I could use some help interpreting DHARMa quantile plots. I understand that, ideally, the three quantile lines should be both horizontal and parallel and that deviations from this ideal could indicate ...
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Is anova() on an lmer model a valid test before pairwise comparisons in a dataset with incomplete information from all participants?
I am at the beginning of my statistics journey and am trying to understand if my reasoning makes sense and what key considerations I am missing.
The study design
In a fictive scenario where a RCT was ...
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Prediction for glmm (correcting for bias due to jensens inequality?)
I am trying to decide on the best method for producing model predictions (for graphing) from my generalized linear mixed effects model. I am interested in getting marginal predictions (i.e., what the ...
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Quantile deviations detected gamma GLM
I am trying to apply a Gamma GLM to a dataset. The main issue is the lack of fit for quantile deviations although no other problems are detected. I have read similar posts without a conclusive answer.
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Can bootstrap confidence intervals be illogical?
This was something I thought about:
If you have data from a coin with a very low probability of success, it is possible that the Wald confidence interval can contain negative numbers and be illogical?...
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Is there a way to account for the effect of a combined dataset in a Cox proportional hazards model?
I ran a survival study with two species in 3 different temperatures with 2 different treatments in batches of 5-6 (i.e., species 1 was tested in treatment 1 at temperature 1 two or three times). I ...
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Predicting population-level effects of a hierarchical GAM with both a global smoother and group-level factor-smooth interaction term
I am having difficulty making population-level model predictions on the response scale for a hierarchical binomial generalized additive model (GAM) that contains both a "global smoother" ...
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Which type of anova should I use for unbalanced data (different number of replicates for treatments)?
I have three treatments: T1, T2, and T3. T1 and T2 each have 3 replicates, while T3 has only 2 replicates. I did continuous measurements (V1) over a month, so I am looking for the effect of ...
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