[hmgaudecker]

Summary

The lognormal process draws income in levels while every other process in the test fixture draws log income, but the shared wealth transition exponentiated the state for all of them. The lognormal variant therefore added exp(exp(z)) to wealth, reaching seven orders of magnitude past its wealth grid of 1 to 5. Its value test could only be bounded loosely against an analytic recurrence with a relative tolerance of 1e-4.

The fixture now selects a level transition and constraint for the lognormal process. The lognormal variant is then the normal variant with the exponential moved into the process: same value function, same panel with income exponentiated.

• tests/test_models/processes.py: get_wealth_functions and get_initial_income pick the level variants for lognormal; both the single-regime and the multi-regime fixture use them. A DistributionType alias replaces the repeated Literal, which also lets the cross-regime test drop its ty suppressions.
• tests/test_lognormal_fixture_parity.py: pins value equality with the normal fixture at rtol 1e-12 and panel equality with income exponentiated.
• tests/test_processes.py: the analytic recurrence, its 1e-4 bound and the dedicated tail test are gone; the regression test compares lognormal values to solution_normal.pkl.
• tests/data/processes/random-v1/: panels regenerated at float64 on CPU. Only the lognormal panel changes in content; the other four are byte-different serializations of identical frames and are regenerated together so the provenance record describes every file in the directory.

Verification

tests/test_processes.py and the parity test in the branch's locked tests-cpu environment, --precision=64, CPU: 768 passed, 0 failed. prek run --all-files passes.

https://claude.ai/code/session_01LAZ63AjbZFLweWuJyPUs6S

[read-the-docs-community]

Documentation build overview

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± beta-delta/index.html
± epstein-zin/index.html
± iskhakov-et-al-2017/index.html
± tiny-example/index.html

[hmgaudecker]

Superseded: cherry-picked onto #636 (6bb9f21, df375f5), which is where the fixture's extrapolation turned red. Main receives it through the stack.