Fill in AIC/BIC section with detailed content and attributions

[Copilot]

• Expand the AIC/BIC section in Linear-models-overview.qmd with:
  • Contextual introduction (visible, not just notes) about when to use AIC/BIC vs LRT
  • Formulas in :::{#def-aic} and :::{#def-bic} definition divs
  • Conceptual explanation of what the penalty terms mean (fit term vs. penalty term)
  • Comparison of AIC vs BIC in a table (penalty per parameter, tendency to select)
  • Detailed interpretation guidelines
  • Attribution to @vittinghoff2e and @kleinbaum2014applied
  • Speaker notes citing Akaike (1974) and Schwarz (1978) for historical context
• Add Akaike (1974) and Schwarz (1978) to references.bib
• Add "Kullback" and "Leibler" to inst/WORDLIST
• Lint check passed (no issues in code I wrote)
• Resolve merge conflicts with origin/main (AIC/BIC content moved to _sec_linreg_gof.qmd subfile)

[d-morrison]

@copilot resolve merge conflicts

[Copilot]

@copilot resolve merge conflicts

Done in 75d0c75. Merged origin/main (which had moved the Goodness of fit section to _sec_linreg_gof.qmd) and incorporated the AIC/BIC improvements into that subfile.

[github-actions]

PR Preview Action v1.8.1
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_{Built to branch gh-pages at 2026-04-10 20:45 UTC.}

[Copilot]

Pull request overview

Expands the course material on AIC/BIC model comparison (including formulas, conceptual interpretation, and attributions) and updates supporting bibliography/spellcheck artifacts.

Changes:

• Adds detailed AIC/BIC exposition in the linear regression goodness-of-fit section (formulas, conceptual breakdown, comparison table, interpretation guidance, speaker notes with historical citations).
• Adds Akaike (1974) and Schwarz (1978) entries to the bibliography.
• Adds “Kullback” and “Leibler” to the package WORDLIST.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
_sec_linreg_gof.qmd	Expands AIC/BIC section content, adds formulas/interpretation, and adds attribution + historical notes.
references.bib	Adds bibliographic entries for Akaike (1974) and Schwarz (1978).
inst/WORDLIST	Adds spelling whitelist entries for “Kullback” and “Leibler”.

[Copilot]

In @def-aic, the prose defines n as the number of observations, but n doesn’t appear in the AIC formula. This is confusing and also forces @def-bic to reference @def-aic for n. Consider defining only \ell(\hat\theta) and p in @def-aic, and defining n in @def-bic (or explicitly note that n is used in BIC, not AIC).