Summarize competing-risks article in summary.qmd with proper citation wiring

[Copilot]

• Inspect PR comments and identify actionable review feedback
• Check repository state and locate affected bibliography entry
• Update references/references.bib to match style and fix DOI URL encoding issue
• Run targeted validation for changed files
• Run final automated validation
• Reply to the new PR comment with the fixing commit hash

[Copilot]

Pull request overview

This PR replaces placeholder content in the book’s summary.qmd chapter with a cited synopsis of Gooley et al. (1999) on cumulative incidence vs. 1−Kaplan–Meier under competing risks, and adds the corresponding BibTeX entry so the citations render.

Changes:

• Rewrote summary.qmd to summarize the competing-risks estimator comparison and provide a practical takeaway, with inline citations.
• Added a @gooley1999competing entry to references/references.bib and referenced it from the new summary text.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
summary.qmd	Replaces placeholder chapter content with a cited methodological summary and takeaway.
references/references.bib	Adds the Gooley et al. (1999) bibliography entry used by the new summary citations.

[Copilot]

The url field contains raw < and > characters, which makes the URL invalid and can break link rendering in HTML/PDF outputs. Consider percent-encoding these characters (e.g., %3C / %3E) or using an alternative canonical URL that does not include angle brackets.

Suggested change

	url = {https://doi.org/10.1002/(SICI)1097-0258(19990330)18:6<695::AID-SIM60>3.0.CO;2-O}
	url = {https://doi.org/10.1002/(SICI)1097-0258(19990330)18:6%3C695::AID-SIM60%3E3.0.CO;2-O}

[Copilot]

This new BibTeX entry is the only one in the file that indents fields with extra leading spaces. For consistency with the rest of references.bib, consider aligning the formatting (remove the extra indentation before field names).

Suggested change

	author = {Gooley, Ted A. and Leisenring, Wendy and Crowley, John and Storer, Barry E.},
	title = {Estimation of Failure Probabilities in the Presence of Competing Risks: New Representations of Old Estimators},
	journal = {Statistics in Medicine},
	year = {1999},
	volume = {18},
	number = {6},
	pages = {695--706},
	doi = {10.1002/(SICI)1097-0258(19990330)18:6<695::AID-SIM60>3.0.CO;2-O},
	url = {https://doi.org/10.1002/(SICI)1097-0258(19990330)18:6<695::AID-SIM60>3.0.CO;2-O}
	author = {Gooley, Ted A. and Leisenring, Wendy and Crowley, John and Storer, Barry E.},
	title = {Estimation of Failure Probabilities in the Presence of Competing Risks: New Representations of Old Estimators},
	journal = {Statistics in Medicine},
	year = {1999},
	volume = {18},
	number = {6},
	pages = {695--706},
	doi = {10.1002/(SICI)1097-0258(19990330)18:6<695::AID-SIM60>3.0.CO;2-O},
	url = {https://doi.org/10.1002/(SICI)1097-0258(19990330)18:6<695::AID-SIM60>3.0.CO;2-O}

[github-actions]

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[d-morrison]

@copilot apply changes based on the comments in this thread

[Copilot]

@copilot apply changes based on the comments in this thread

Applied the requested thread changes in references/references.bib: normalized field indentation for @gooley1999competing and updated the DOI URL to use encoded angle brackets. Included in commit 6ccf10c.