Thread vcov_type through StackedDiD (Phase 1b 2/8) - #479

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stacked-did-vcov-type-phase1b-2

May 21, 2026

Commits on May 21, 2026

stacked_did: thread vcov_type (Phase 1b 2/8)

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stacked_did: propagate BM Satterthwaite DOF into aggregated inference (R1 P0)

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stacked_did: BM contrast DOF on identified-column reduced design (R2 P1)

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stacked_did: fail-closed when BM contrast DOF unavailable (R2 P1)

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stacked_did: address R4 polish (P2 warning text + P3 set_params + P3 drift lock)

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stacked_did: address R5 P3 polish (explicit weight_type + real rank-deficient test)

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stacked_did: R6 P3 polish — overall SE parity + CSV drift check

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stacked_did: R7 P1 parameter-interaction coverage + P3 fixture tightening

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stacked_did: R8 P1 variant R-parity (anticipation, weighting='population')

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stacked_did: R9 P1 — sample_share parity + DOF asserts on all variants

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stacked_did: address CI codex R1 P2 + P3 polish

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stacked_did: address CI codex R2 P2 — clustered variance label

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