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# Research log — WP22 SHARP-HPI

When (2026-10-21) Phase What
00:15 0 Discovery: Vrai Prix production DB on M3U96a, QWHPI engine in PhD/recherche, UQO WP template; plan written (docs/PLAN.md)
00:30 1 Immutable snapshot (sqlite3 .backup, SHA-256 pinned); four earlier vintages collected for the publication-lag audit
00:40 1 Extraction → parquet layers; profiling; spatial join to SDA V2026-07; MAMH register; classification and exclusion ledger (632,006 headline sales)
00:50 1 Finding: roll unite_voisinage is a unit-level code → fine location = nested metric grid; finding: provider valeur_role = assessment in force at sale
01:00 2–3 Hedonic engine (pyfixest, Huber-IRLS), benchmarks A–K, state-space module (local level / LLT, robust innovations, grid-EM empirical Bayes), SHARP nested hierarchy, panel schema
01:10 3 Literature agent: 115 references verified via Crossref; HMTS and RTD method notes; novelty scan
01:15 4 Monte Carlo framework (9 scenarios incl. 2 counter-examples), 80 replications × 9 scenarios launched (12 workers)
01:20 5 Full panel: 2,696 cells × 69 months; reliability bundle; representative prices
01:25 6 Real-time vintages (July 2022 → October 2026, 10-day delay) launched; validation: aggregation, composition shock, placebo, Moran, repeat sales, bootstrap, ablations, trimming
01:30 6 External indices (Teranet, CREA, StatCan) obtained by agent; comparison on annual means; Montréal gap diagnosed (type composition, richer CREA attributes); Québec City agreement
01:40 7 Manuscript sections 1–6, 8, 10–11 and appendices drafted; figure and table generators; tests (9 passing)
14:00–16:30 4–7 Laptop slept 01:38→13:43 (battery); Monte Carlo resumed and completed (720 reps); vintages regenerated with filtered + smoothed modes; benchmarks and HMTS completed; sections 7 and 9 written; 49-page manuscript compiles with 0 missing macros