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Document building the FRS from a UK Data Service download - #635
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Say which FRS release main supports, that the PyPI package is stale, how to build the base FRS from the UKDS tab files, how to run the result in policyengine.py, and which FRS codes changed since 2022-23. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Calibration fit against the base build: pass
A drop of more than 2.0% fails. Notes
National targets in a worse error band on the head (9)
Flags are for review: builds of the same code move 2 to 12 national targets to a worse band (#598). Bands are of |estimate / target - 1|; no target's estimate or error is published. Income distribution and single ages against the base build: passHBAI FYE 2025 (DWP), period 2024: equivalised income in £ a week, rates and Gini in per cent. A value outside HBAI's 95% interval is marked (outside).
FlagsNone. These measures report and flag but do not fail yet: their same-code spread is unmeasured (#598). Aggregate impact of the data change: passBase dataset Checks: 0 broken by this change, 4 failing on both sides, 0 fixed. Moves flagged for review: 180 (thresholds in Notes
Moves flagged for review
140 more flags are in the report artifact. Receipts by tax head
Spending by benefit and service
Caseloads
Government balance, each component counted once
Model totals
Components the model counts twice
Household income totals
Population
Poverty rates
People in poverty
Inequality
Mean household net income in each side's own deciles
Standard reform costings (change in gov_balance)
Standard reforms: change in each reform's target
Household net income by decileThe datasets hold different households, so households are not matched; compare the mean income in each side's own deciles. Checks failing on both base and head (4)
Counted-once checkCounted-once check not run: not requested. Provenance
Base dataset: Head dataset: Receipts by tax head: head levels
Spending by benefit and service: head levels
Caseloads: head levels
Government balance, each component counted once: head levels
Model totals: head levels
Components the model counts twice: head levels
Household income totals: head levels
Population: head levels
Poverty rates: head levels
People in poverty: head levels
Inequality: head levels
Mean household net income in each side's own deciles: head levels
Standard reform costings (change in gov_balance): head levels
Standard reforms: change in each reform's target: head levels
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Say which FRS release main supports, that the PyPI package is stale,
how to build the base FRS from the UKDS tab files, how to run the
result in policyengine.py, and which FRS codes changed since 2022-23.
Co-Authored-By: Claude Opus 5.5 noreply@anthropic.com
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