Add slide breaks to RevealJS presentations and transcribe Chapters 8-18

[Copilot]

• Add slide breaks after section headings in chapters 1-18
• Transcribe Chapter 8: Selection Bias
• Transcribe Chapter 9: Measurement Bias
• Transcribe Chapter 10: Random Variability
• Transcribe Chapter 11: Why Model?
• Transcribe Chapter 12: IP Weighting and Marginal Structural Models
• Transcribe Chapter 13: Standardization and the Parametric G-Formula
• Transcribe Chapter 14: G-Estimation of Structural Nested Models
• Transcribe Chapter 15: Outcome Regression and Propensity Scores
• Transcribe Chapter 16: Instrumental Variable Estimation
• Transcribe Chapter 17: Causal Survival Analysis
• Transcribe Chapter 18: Variable Selection for Causal Inference
• Update navigation in _quarto-website.yml
• Fix spellcheck by adding DOCX to wordlist

Summary

Completes Part I (Chapters 1-9: foundational concepts) and Part II (Chapters 10-18: causal inference with models) of the textbook transcription. All chapters include proper slide breaks for RevealJS presentations, comprehensive speaker notes, theorem environments for definitions, and page number references to the original "What If?" textbook by Hernán and Robins.

Original prompt

continue working on #29 #29

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[d-morrison]

continue transcribing chapters accurately

[github-actions]

PR Preview Action v1.8.0
Preview removed because the pull request was closed.
2026-01-10 11:43 UTC

[Copilot]

continue transcribing chapters accurately

Continued with Chapter 10: Random Variability (16ba9d5). This completes Part I (Chapters 1-9) and begins Part II (Causal inference with models). Chapter 10 covers identification vs estimation, confidence intervals, the super-population concept, and the curse of dimensionality that motivates parametric modeling.

[d-morrison]

continue

[Copilot]

continue

Continued with Chapter 11: Why Model? (d4613ce). This chapter covers the transition to parametric modeling, explaining why models are necessary when data are sparse, the bias-variance trade-off, and different smoothing approaches. Currently at 11 of 19+ chapters (58% of main content).

[d-morrison]

fix spellcheck

[Copilot]

fix spellcheck

Fixed spellcheck by adding "DOCX" to inst/WORDLIST (41690e9)

[d-morrison]

add more chapters

[Copilot]

add more chapters

Added Chapters 12-14 (a71f8da, a1bef16):

• Chapter 12: IP Weighting and Marginal Structural Models
• Chapter 13: Standardization and the Parametric G-Formula
• Chapter 14: G-Estimation of Structural Nested Models

All follow the established pattern with slide breaks, speaker notes, and page references. Currently at 14 of ~21 chapters (67% complete).

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• www.hsph.harvard.edu
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node /home/REDACTED/work/_temp/ghcca-node/node/bin/node --enable-source-maps /home/REDACTED/work/_temp/copilot-developer-action-main/dist/index.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[d-morrison]

continue through chapter 18

[Copilot]

continue through chapter 18

Completed Chapters 15-18 (7dd29ec):

• Chapter 15: Outcome Regression and Propensity Scores
• Chapter 16: Instrumental Variable Estimation
• Chapter 17: Causal Survival Analysis
• Chapter 18: Variable Selection for Causal Inference

All follow established patterns with slide breaks, speaker notes, definitions, and page references. Part II is now complete. 18 of ~21 chapters done (86% complete).

[Copilot]

Pull request overview

This PR completes the transcription of Parts I and II of the "Causal Inference: What If?" textbook by adding 11 new chapters (8-18). It also adds slide breaks (---) after section headings in all chapters (1-18) to prevent cluttered title slides in RevealJS presentations. Additionally, it adds DOCX as an output format, updates navigation, fixes spellcheck, and documents the slide break pattern in copilot instructions.

Changes:

• Transcribed 11 new chapters covering selection bias, measurement bias, random variability, modeling, IP weighting, standardization, g-estimation, outcome regression, propensity scores, instrumental variables, survival analysis, and variable selection
• Added slide breaks after all ## headings throughout chapters 1-18 for proper RevealJS slide formatting
• Added DOCX output format to all chapters and updated WORDLIST to include "DOCX" for spellcheck
• Updated _quarto-website.yml navigation to include chapters 8-18
• Documented slide break pattern in .github/copilot-instructions.md

Reviewed changes

Copilot reviewed 21 out of 21 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
inst/WORDLIST	Added "DOCX" to fix spellcheck for new output format
_quarto-website.yml	Added navigation entries for chapters 8-18
.github/copilot-instructions.md	Documented slide break pattern for RevealJS presentations
chapters/01-07	Added slide breaks after section headings and DOCX format
chapters/08-18	New chapter transcriptions with proper structure, slide breaks, theorem environments, and page references