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Require policyengine-us >= 1.552.0 for deterministic results #697

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Require policyengine-us >= 1.552.0 for deterministic results #697

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@MaxGhenis MaxGhenis commented Feb 8, 2026

Summary

  • Pin policyengine-us >= 1.552.0, which moved all stochastic randomness (SNAP, Medicaid, ACA, WIC takeup draws) from the country package to the data package
  • Ensures policyengine-taxsim always produces deterministic results for the same inputs — no seed needed

Prompted by BEA reporting non-deterministic results across runs.

Test plan

  • CI passes with the new pin
  • Verify same inputs produce identical outputs across multiple runs

🤖 Generated with Claude Code

@MaxGhenis @claude
Require policyengine-us >= 1.552.0 for deterministic results
dc14a5d 
Pre-1.552.0 versions had random() calls in takeup variables (SNAP,
Medicaid, ACA, WIC) that produced non-deterministic results across
process runs. Version 1.552.0 moved all stochastic logic to the data
package, making the country package fully deterministic.

Co-Authored-By: Claude Opus 4.6 <[email protected]>
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