Interpret linear mixed model diagnostics and summary statistics to evaluate the linear mixed model structure and variable selection.
Free CAS MAS-II (Modern Actuarial Statistics II) lesson in Linear Mixed Models. 13 min read, ~1,946 words.
Two residual layers. Marginal residuals check the fixed part. Conditional residuals check the within-group fit. Random effects need their own QQ plot. Predicted BLUPs should look Normal; banana or step patterns flag the wrong grouping or omitted covariate. AIC, BIC, and rank models, but you must compare REML fits only...
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What this lesson covers
- Content
- Example 1
- Example 2
- Common Mistakes
- Key Takeaways
- Exam Shortcuts
Learning objectives
- B4
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