feat(psychometric): restore Driver p.16 DIFFUSIONstd q/p=−2a on main - #476
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feat(psychometric): restore Driver p.16 DIFFUSIONstd q/p=−2a on main#476seonghobae wants to merge 1 commit into
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Restore the exact scalar Driver, Oud, and Voelkle (2017) p.16 DIFFUSIONstd map independently on current main. Form strictly positive asymDIFFUSION p = −q/(2a) first, then q/p. The scalar stationary ratio is −2a. 2017-era summary.ctsemFit.R forms unstandardised DIFFUSION and asymDIFFUSIONstd and does not form a DIFFUSIONstd matrix; footnote 4 still licenses this map. Do not convert stale draft #313. One named std map per PR.
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seonghobae
marked this pull request as draft
September 1, 2026 20:00
This was referenced Sep 1, 2026
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Superseded by the Longitudinal Modeling landing vehicle
Closed after source-level verification against surviving PR #310 exact head
4e7435f6dd232ae8e1e019f1393e7285e32c6527.This Draft's unique scientific evidence is preserved rather than discarded: #310 now implements the continuous scalar diffusion-standardisation candidate in
crates/longitudinal_core/src/diffusion.rs, preserves the positive-stationarity admission contract, distinct-estimand refusals, extreme-scale behavior, subnormal-rounding regression, and research-candidate status, with executable contract coverage incrates/longitudinal_core/tests/standardised_diffusion_contract.rs. The owner move is intentional: temporal/state composition belongs to TEPP Longitudinal Modeling, not the genericpsychometric_coretechnical layer.The immutable discussion and this branch remain scientific lineage. Do not merge this predecessor independently. #310 is the landing authority for the folded behavior and must satisfy its own exact-head checks/review before protected-main integration.
Original scope preserved below for lineage.
Restore one named Driver, Oud, and Voelkle (2017) p. 16 map on current
main: scalarDIFFUSIONstdasq / p = −2 aafter strictly positiveasymDIFFUSIONp = −q / (2 a).The 2017-era ctsem source forms unstandardised
DIFFUSIONandasymDIFFUSIONstd, but does not emit a namedDIFFUSIONstdmatrix. This scalar map remains a research-candidate extension, not canonical ctsem output or production DSEM estimation.