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PolicyEngine UK Data

PolicyEngine's project to build accurate UK household survey data.

Public enhanced CPS

This repo now also includes a public calibrated microdata file:

  • policyengine_uk_data/storage/enhanced_cps_2025.h5
  • source manifest: policyengine_uk_data/storage/enhanced_cps_source_2025.csv

The UK enhanced CPS starts from PolicyBench's public 1,000-household CPS-derived sample, maps those records into a UKSingleYearDataset, aligns core UK-facing inputs such as council tax bands, vehicle ownership, pensions, disability/PIP, consumption, and capital gains, and then recalibrates the household weights against the UK national/region/country target registry used by the loss pipeline.

On the native 2025 loss matrix, that alignment plus reweighting step cuts mean absolute relative error from roughly 3.81 on the raw transfer weights to roughly 0.39 on the calibrated dataset.

This is a public calibrated dataset, not a replacement for the FRS or enhanced FRS. It is intended as the first step in a broader cross-country public-microdata strategy.

Programmatic entrypoints:

  • policyengine_uk_data.datasets.create_enhanced_cps
  • policyengine_uk_data.datasets.save_enhanced_cps

Backward-compatible aliases remain available:

  • policyengine_uk_data.datasets.create_policybench_transfer
  • policyengine_uk_data.datasets.save_policybench_transfer