Add DLA and SDA documentation page (#771)#1709
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Ticks off the DLA and SDA entries in #771's docs-pages todo list. Combined into one page because both are closed-to-new-claims legacy DWP disability benefits with very small modelling surface area: - DLA: two component variables (dla_m, dla_sc), each taking a categorical band from the dataset input and multiplying the weekly rate by WEEKS_IN_YEAR. The eligibility-by-activity scoring is not re-derived because the dataset records bands directly; the relevant population (under-16s and unmigrated working-age recipients) is set by the calibration step in policyengine-uk-data. - SDA: single weekly flat-rate payment, binary eligibility taken from sda_reported, maximum age-related addition assumed (justified because the remaining 2001-frozen caseload skews old). References cover SSCBA 1992 s.68/s.71, the Welfare Reform Acts that closed both schemes to new claims, and the DWP caseload statistics page used for calibration.
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Summary
docs/book/programs/gov/dwp/disability-legacy-benefits.mdcovering:dla_m,dla_sc), the categorical band inputs (dla_m_category,dla_sc_category), the weekly-rate -> annual multiplication, and a note on why eligibility isn't re-derived (calibration handles the post-2013 migration to PIP inpolicyengine-uk-data).sda_reportedtimes the maximum age-related addition, with the simplification explained.Test plan
./PIP.ipynb).programs/gov/dwp/.🤖 Generated with Claude Code