Statistical Analysis Stack Exchange
Statistical Analysis Stack Exchange

Questions tagged [model-checking]

9 questions
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Negative binomial GLM: model checking in R

I'm using a negative binomial GLM in R, but I could not solve the following issues (using McCullagh and Nelder (1989), textbooks and Google): Residual plots. McCullagh and Nelder (1989, p.398) recommend plotting the standardized deviance residuals…
Gerit Wagner
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How do I interpret the angles of two concentration ellipses?

Consider a map with two concentration ellipses like this below. The Vomit_y group is (almost?) perfectly vertical, while the Vomit_n group seems to be oriented at about 45 degrees. I understand that Vomit_y displays no correlation between Dim1 and…
Brett Reynolds
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Test to prove Poker deals are not random

I played on a mobile app of Texas holdem poker called pokerrrr 2. I suspect the game deals non-random hands. How can I prove the deals are not random? I prefer a test that can get an answer using just few hundreds of samples since that game engine…
Cohensius
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Bayesian test quantities

I have a Bayesian model and was looking to do some model checking via Posterior Predictive p-values. From Bayesian Data Analysis (Gelman et al) it is stated that we adopt a test quantity $T(y,\theta)$ in order to assess whether the statistic with…
epp
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Checking GLM model creation and results (especially deviance)

I have a question about my methods to develop a GLM and the results of that GLM (particularly deviance). We were given data around heart valve thickness (measure) and possible explanatory variables (age, smoking habits, activity(SPORT), alcohol…
daverv
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Problems with uniformity in residuals using DHARMA to check zero-inflated count glmm

very new to statistical modelling & have found lots of the existing questions and answers from this community hugely helpful. I'm running into some issues of my own now that I can't find answers to online so I'd be very grateful for any advice you…
jessief
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building a good (mixed) linear model for agri-ecology data

I encountered an problem. I cannot build a good mixed linear model. For example, M <- glmmTMB(Numbers ~ MFS*CD*SNC+ #or you can use lmer() whatever # (MFS^2)+I(CD^2)+I(SNC^2) +(1|SITES/YEAR), data=data, family="poisson" #…
PeterPanPan
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Can I say that my model is acceptable?

I am performing a multiple regression with GAM.I found the significant predictors using the stepAIC function and now I am performing a model checking with mod.check(). This is what a get: m2.k1 <- gam(Totden ~ s(T, k=12) + s(S, k=12) + s(Si, k=12),…
Franc
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How to check if a Machine Learning model is applicable for newly input data?

Suppose we have a good Machine Learning model, with good cross-validation and test score. How can we estimate whether a newly input data instance belongs to the domain of data where model predictions are dependable? To give an example: It is…
amos696
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