Analysis regression bisection worksheet ======================================= StatMedAnalysis | Downloadable worksheet | 5 November 2026 Isolate the first revision that changes a reproducible analysis result. Working instructions Freeze a small failing fixture and define an observable binary outcome. Confirm a known good revision passes and a known bad revision fails under the same conditions. Test intermediate revisions using a disposable checkout. Record revisions that cannot run as skipped and preserve the final candidate set. Working record Save a local copy. Use public, hypothetical or aggregate information. Project code ____________________ Prepared on ____________________ Fixture and deterministic check ___________________________________________________________________ Expected output and tolerance ___________________________________________________________________ Known good revision and evidence ___________________________________________________________________ Known bad revision and evidence ___________________________________________________________________ Intermediate revision and observed result ___________________________________________________________________ Untestable revision and reason ___________________________________________________________________ Earliest candidate and neighboring result ___________________________________________________________________ Minimal cause and regression check ___________________________________________________________________ Hypothetical worked case A fictional aggregation changes from 12 to 13 eligible samples. One intermediate revision cannot run with the documented compiler. Marking it skipped may leave more than one possible first bad revision, which the report must disclose. Decision and follow-up Attribute the first observed change to a commit only when the boundary is established and the test is stable. Repeat the good and bad checks if results vary across runs. A bisection boundary identifies where behavior changed, while the causal code change still needs inspection. Decision _______________________ Date ___________________________ Evidence retained at _____________________________________________ Next action ____________________ Owner __________________________ Official reference checked 5 November 2026 https://git-scm.com/docs/git-bisect