Add Local Housing Allowance parameters

changelog_entry.yaml

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+- bump: patch
+  changes:
+    fixed:
+    - Added missing label for benefit uprating.

policyengine_uk/data/gov/README.md

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+# Data
+
+This folder contains data files used in policy computations that are too granular for YAML parameters to be efficient.
+
+## brma_to_region.csv.gz
+
+This mapping file is used to convert BRMA codes to region codes. It was created by GPT-4 (20 randomly checked and all correct) for English BRMAs; Scottish, Welsh and Northern Ireland BRMAs were added manually.
+
+## local_housing_allowance_list_of_rents.csv.gz
+
+This file contains the list of rents used to determine LHA rates. English BRMAs for 2019 and 2020 are from the Valuation Office Agency [here](https://www.gov.uk/government/collections/local-housing-allowance-list-of-rents). Scottish, Welsh and Northern Ireland BRMAs are matched from the closest English BRMA.

policyengine_uk/data/gov/__init__.py

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+import pandas as pd
+from pathlib import Path
+
+FOLDER = Path(__file__).parent
+
+lha_list_of_rents = pd.read_csv(
+    FOLDER / "local_housing_allowance_list_of_rents.csv.gz",
+    compression="gzip",
+)
+
+brma_to_region = pd.read_csv(
+    FOLDER / "brma_to_region.csv.gz", compression="gzip"
+)
+
+enhanced_frs_brmas = pd.read_csv(
+    FOLDER / "enhanced_frs_brmas.csv.gz", compression="gzip"
+)

policyengine_uk/parameters/gov/benefit_uprating_cpi.yaml

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-description: September CPI
+description: Most recent September CPIH index value, updated for each uprating occurrence.
 values:
   2024-01-01: 132.0
   2023-04-01: 123.8
@@ -25,5 +25,4 @@ values:
   2002-04-01: 75.0
   2001-04-01: 73.8
 metadata:
-  unit: currency-GBP
   label: Benefit uprating index

policyengine_uk/parameters/gov/dwp/LHA/freeze.yaml

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+description: While this parameter is true, LHA rates are frozen in cash terms.
+values:
+  2015-01-01: false
+  2020-01-01: true
+  2024-01-01: false
+metadata:
+  unit: bool
+  label: LHA freeze

policyengine_uk/parameters/gov/dwp/LHA/percentile.yaml

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+description: Local Housing Allowance rates are set at this percentile of private rents in the family's Broad Rental Market Area. This parameter does not apply if LHA is frozen.
+values:
+  2015-01-01: 0.3
+metadata:
+  unit: /1
+  label: LHA percentile