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gb_stpr(), gb_discount_factor(),
gb_discount(): kinked Social Time Preference Rate
(standard, health, catastrophic-risk variants) and discount
factors.gb_npv(), gb_eanc(): net present value and
equivalent annual net cost.gb_deflator(), gb_real(),
gb_rebase(): GDP-deflator factors and real-terms conversion
against a bundled vintage.gb_optimism_bias(), gb_apply_ob(),
gb_categories(): lookups for the Mott MacDonald (2002)
upper bounds across six project categories with mitigation factor
support.gb_dist_weight(), gb_dist_weighted_npv():
iso-elastic distributional weights using Green Book default eta =
1.3.gb_metb(): Marginal Excess Tax Burden uplift with
vintage lookup (20 percent in 2018+, 30 percent historical).gb_wellby(): WELLBY conversion to GBP per HMT Wellbeing
Guidance (July 2021). Central GBP 13,000 in 2019 prices.gb_vpf(): Value of Preventing a Fatality per DfT TAG.
GBP 2.153 million in 2024 prices.gb_qaly(): Quality-Adjusted Life Year per DHSC
supplementary Green Book guidance (GBP 70k) plus NICE thresholds.gb_carbon_value(): DESNZ Carbon Values for Appraisal,
central / low / high paths, traded and non-traded sectors.gb_carbon_npv(): NPV of an emissions path with full
discounting and rebasing.gb_appraise(): end-to-end appraisal in one call.
Optionally applies optimism bias and METB to costs, then computes NPV
and BCR with full provenance.gb_compare(): side-by-side comparison of two or more
options with NPV / BCR / EANC ranking and preferred-option
selection.gb_progression(): track an appraisal across SOC, OBC,
FBC business case stages.gb_place_based(): aggregate sub-projects into a
place-based business case (per Green Book 2026), with optional synergy
uplift.gb_economic_case(): wrap an appraisal in Five Case
Model Economic Case structure (CSFs, options, monetised summary,
non-monetised, VfM, recommendation).gb_validate(): lint an appraisal for sign-convention,
base-year, schedule, and consistency errors.gb_risk_register(): build a risk register with
monetised exposure (probability x impact), aggregate by category, and
optionally risk-adjust an appraisal NPV.gb_sensitivity_ob(): optimism bias sensitivity sweep
across a vector of mitigation factors. Required at every Green Book
business case gateway.gb_headline(): one-page summary with NPV, BCR, EANC,
payback, and provenance.gb_cost_per_unit(): cost-effectiveness ratio (PV cost
per QALY, WELLBY, tCO2e, etc.).gb_to_latex(): render an appraisal as a LaTeX
table.gb_to_excel(): multi-sheet Excel export (requires
openxlsx).gb_to_word(): one-page Word document export (requires
officer and flextable).gb_schedule_table(), gb_data_versions():
tibble of the STPR schedule and vintage metadata for all eight bundled
parameter tables (STPR, GDP deflator, optimism bias, METB, WELLBY, VPF,
QALY, carbon values).gb_appraisal S3 class with print(),
summary(), format() methods. The
summary() method renders BCR, optimism bias, METB,
distributional eta, and unweighted NPV when present.These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
Health stats visible at Monitor.