Extraction: richer OWID trend and model-fit output#72
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_owid_common now augments the OWID trend table with 7/30-row deltas, increment statistics, and least-squares fits — a linear fit on the recent cumulative series and an exponential fit on incident (new_cases) data — plus a question-target focus line. The fits are pure standard library (math/statistics); the public fetch_owid signature is unchanged (only the private _trend_table_html gains a keyword-only is_target_entity). Adds numeric unit tests for the fit helpers alongside the branch's rendering assertions. Extracted from @rapsoj's #67. Co-Authored-By: Jess Rapson <jessicakristenr@gmail.com> Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Extracted from @rapsoj's #67.
What
_owid_commonnow augments the OWID trend table with 7/30-row deltas, increment statistics, and least-squares fits — a linear fit on the recent cumulative series and an exponential fit on incident (new_cases) data — plus a question-target focus line.Notes
math/statistics); no new dependencies.fetch_owid(...)signature is unchanged; only the private_trend_table_htmlgains a keyword-onlyis_target_entity. The mpox/covid scraper modules need no edits.Tests
Keeps the branch's rendering assertions and adds numeric unit tests for the fit helpers (known slope/doubling/R²). Full suite green.