Add docs page comparing PolicyEngine and RF nowcasting methodologies (#1171)#1706
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Add docs page comparing PolicyEngine and RF nowcasting methodologies (#1171)#1706vahid-ahmadi wants to merge 1 commit into
vahid-ahmadi wants to merge 1 commit into
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#1171 asked for a docs page describing how PolicyEngine's nowcast differs from the Resolution Foundation's (per their Living Standards Outlook appendix). Add it under docs/book/assumptions/nowcasting-comparison.md. The page is high-level rather than a parameter audit, covering the five axes where the two methodologies typically diverge: - wage-floor / NLW handling and spillover effects (RF models the floor explicitly; PolicyEngine uprates earnings by the OBR index), - benefit uprating and the triple lock, - take-up handling, - calibration targets (PolicyEngine adds LA-level rent and council-tax targets that the public RF nowcast does not), - horizon (the long-run divergence beyond 2030). It also gives a short "when results disagree, look here first" guide so users can interpret discrepancies between the two nowcasts.
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Summary
docs/book/assumptions/nowcasting-comparison.mdsummarising the five axes where PolicyEngine's UK nowcast typically diverges from the Resolution Foundation's Living Standards Outlook methodology:Doesn't try to mechanically reconcile values — that's tracked separately under #1400 (RF methodology comparison) and #1179 (RF earnings growth) and would need access to RF's underlying model.
Test plan
assumptions/.🤖 Generated with Claude Code