The diagnostic tag has no wiki summary.
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1answer
2k views
How to interpret model diagnostics when doing linear regression in R?
I ran lm() on my data with models selected by individual lm's of each characteristic and then combined the top $R^2$ based on ...
6
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2answers
411 views
Possible extensions to the default diagnostic plots for lm (in R and in general)?
I started digging a bit into the plot.lm function, this function gives six plots for lm, they are:
a plot of residuals against fitted values
a Scale-Location plot of sqrt(| residuals |) against ...
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4answers
261 views
Communicating Regression Model Results
I am concerned about how unequipped most people are (both within and without academia) to properly employ standard model building methods such as linear regression and to interpret the results of ...
11
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2answers
404 views
What diagnostic plots exists for quantile regression?
Following on my question for OLS, I wonder: what diagnostic plots exists for quantile regression? (and are there R implementation of them?)
A quick google search already came up with the worm plot ...
8
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1answer
375 views
What type of post-fit analysis of residuals do you use?
When carrying out OLS multiple linear regression, rather than plot the residuals against fitted values, I plot the (internal) Studentized residuals against fitted values (ditto for covariates). These ...
6
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2answers
2k views
Interpreting residual diagnostic plots for glm models?
I am looking for guidelines on how to interpret residual plots of glm models. Especially poisson, negative binomial, binomial models. What can we expect from these plots when the models are ...
3
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1answer
827 views
Explanation of R diagnostic plot for logistic regression
I'm hoping someone can explain this bit of R code for me related to glm(). I don't understand the diagnostic plot that has been suggested. It seems a more ...
2
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1answer
233 views
Functions for regression diagnostics on mer objects in R
I'm particularly interested in plotting residuals against fitted values, and residuals against predictors. Often times I need to make boxplots of the residuals conditional on predictors.
I'd be ...
