GCRI · システミックリスク管理
定量的・定性的手法
リスクアセスメント uses numbers where data support them and structured judgement where they do not. Probabilistic models, loss distributions, 専門家の意見聴取, bow-tie diagrams and risk matrices each answer different questions and fail in different ways. This page sets out how the main methods work, when each is fit for purpose, and how combining them keeps an assessment honest about what is known and what is assumed.
Quantitative and qualitative methods on the record.
Quantitative and qualitative methods: how the risk develops.
Probability, uncertainty and judgement. The dossier below sets out how the risk develops, what is measured, where the data come from, how it is modelled and who decides.
Models need data that fit
Frequency and severity models work where events are numerous and recorded consistently. For rare, novel or changing risks the data are thin, and a precise-looking number can carry more assumption than evidence.
Judgement carries biases
Experts anchor on recent events, overestimate their own precision and converge in groups. Structured elicitation reduces these effects by separating estimates, asking for ranges and scoring calibration.
Matrices compress information
Likelihood and consequence matrices are quick to use, but they rank risks coarsely, can reverse orderings and hide correlated losses. They suit screening, and need other methods before a major decision.
Methods combine through structure
Fault trees, event trees and bow-tie diagrams link causes, controls and consequences. They provide a frame into which quantitative estimates and expert judgement can be placed and checked.
Cascade and stress lab.
このテーマを追跡するためにチームが使う画面:その指標、状態、決定。名前は例であり、値はイメージです。
Cascade and stress lab
Quantitative and qualitative methods · National system · Scenario SC-40
Interdependency graph
red: failed in scenario
Cascade sequence
- T+0HAZHeatwave and drought
- T+6hENGThermal plant derated, cooling water
- T+9hICTData centre on backup power
- T+14hWATPumping reduced, pressure loss
- T+20hHLTHospital water supply at risk
Service loss by system
Methods must be fit for risks that cross domains.
- 水結合Hydrological risk is mostly quantified with simulation and extreme value statistics.What to watchUncertainty ranges reported with return periods
- 健康結合Epidemic risk combines transmission models with expert judgement early in outbreaks.What to watchStructured elicitation records
- 生物多様性結合Ecosystem risks often have qualitative evidence only, which matrices flatten.What to watchQualitative evidence kept as such
Method comparisons are designed for the 手法と技術シリーズ. Cox showed in 2008 that risk matrices can rank risks inconsistently; the page sets out when quantitative, semi-quantitative and qualitative methods each fit.
- Comparisons of assessment techniques applied to the same risk.
- Cases where a リスク・マトリクス misled a decision.
How quantitative and qualitative methods is modelled, measured and tested.
モデル、その仮定、データ、不確実性を、科学者やエンジニアが確認する形で示します。構造は公表された手法に従っています。描かれた値は例示であり、知見ではありません。
モデル、方程式、仮定
The model structure used for quantitative and qualitative methods, the assumptions it makes and how each is tested.
Ri = f(Hi, Ei, Vi, Ci)ハザード、エクスポージャー、脆弱性、対処能力EAL = ∑k pk · Lk年間確率 pkxt+1 = A xt + B ut + εtA carries the couplings, u the shock, ε the error| 仮定 | 作られる理由 | 検証の方法 |
|---|---|---|
| 一つの事象の中では、ハザードとエクスポージャーは独立している | 損失の積分を扱いやすく保つ | 同時記録に当てはめたコピュラと比較 |
| 結合は動作点の近くで線形である | ショックを A を通じて伝播させる | 線形範囲を超えて摂動を与えて比較する |
| 脆弱性曲線は場所を越えて適用できる | 地域固有の曲線はめったに得られない | 観測された損失がある場合はそれに照らして検証 |
- 入力
- 来歴付きのバージョン管理されたデータセット
- 成果物
- 分布であり、単一の数値ではない
- コード
- モデルカードと試験とともに公開
- 再現
- 同じデータ、コード、環境、シード
何を、どの程度うまく測定しているか。
各指標には、その単位、更新頻度、背後にある出典の種類、値が持つことになるエビデンスのラベルが付いています。値は表示しません:プログラムが自らの権限のもとで値を提供します。
| 指標 | 単位 | 周期 | 出典の種類 | ラベル |
|---|---|---|---|---|
| Risks assessed with quantitative estimates | percent of principal risks | 年次 | Assessment records | 報告値 |
| Calibration of expert estimates | calibration score on seed questions | per elicitation | Structured expert judgement records | 観測 |
| Loss event records | count of events with cause and amount recorded | 継続的 | Internal loss databases | 観測 |
| Assessment uncertainty range | ratio of upper to lower bound | 評価ごと | Assessment outputs | 推定 |
| Controls with tested effectiveness | percent of key controls | 年次 | Control testing records | 報告値 |
| Method documentation completeness | percent of assessments with method, data and assumptions recorded | 年次 | Assessment files | 報告値 |
エビデンスの出所。
名前の明示された公開データセットと機関の記録。それぞれにライセンス区分があります。合意に基づく出典は、その条件のもとでのみ使用し、再公開することはありません。
| 出典 | 提供するもの | ライセンス区分 |
|---|---|---|
| IEC 31010 リスクアセスメント 技法 | Descriptions, strengths and limits of more than forty techniques | Licensed standard, purchase required |
| EM-DAT 国際災害データベース(CRED、ルーヴァン・カトリック大学) | Disaster events with human and economic impacts | Free for non-commercial use with registration |
| 仙台防災枠組 Monitor and national disaster loss databases | Published reporting of disaster losses against Sendai targets | 公開、国連の利用規約 |
| TU Delft expert judgement database | Past structured expert judgement studies with calibration data | Licence to check |
| Published operational loss data consortia summaries | Aggregate operational loss patterns in financial services | Members only; public summaries (to check) |
誰が決め、エビデンスが何に役立つか。
システミック・リスク Management prepares evidence. The decisions below are taken by the authorities named, under their own rules, and never by the platform.
| 誰が決定するか | 質問 | このページが提供するエビデンス |
|---|---|---|
| Risk functions and analysts | Which method fits a given risk and decision | Method selection guides; documentation standards |
| Boards and executives | How much confidence to place in an assessment before acting on it | Uncertainty ranges; method documentation; calibration records |
| Regulators and supervisors | Whether an institution’s risk models are fit for the use made of them | Model documentation; validation and back-testing evidence |
このトピックが生み出す成果物
- Method selection guides keyed to the question and the evidence available
- 構造化された 専門家の意見聴取 protocols with calibration
- Bow-tie and fault-tree templates linked to registers
- Assessment files that record data, assumptions and ranges
What methods experts ask.
- Is there enough relevant data to estimate probabilities, or would numbers convey a false sense of precision?
- What kind of uncertainty dominates: randomness, lack of knowledge, or disagreement about how the system works?
- How sensitive is the decision to the parts of the analysis that are least certain?
- How can expert judgement be elicited so that it is transparent and less prone to bias?
Kinds of uncertainty.
Randomness
Natural variability that persists even with perfect knowledge, such as weather from year to year. Probability handles it well.
Lack of knowledge
Uncertainty that more data or research could reduce. It should be shown, not hidden in a single number.
Disputed structure
Where experts disagree on models, probabilities or values. Scenarios and robust decision methods suit it better.
A toolkit, matched to the problem.
- 01
Statistical and probabilistic models
Frequency analysis, extreme value methods and Bayesian inference from 確率と統計. Limits: rare events are poorly sampled, and past data may not reflect a changing system.
- 02
不確実性の定量化
不確実性の定量化とモデル検証 propagates input uncertainty through models and tests them against data. Limits: it cannot capture what the model leaves out.
- 03
構造化された専門家判断
Formal elicitation protocols that calibrate and combine expert views. Limits: time-consuming, and experts share blind spots.
- 04
Qualitative assessment
Scales, matrices and narrative analysis. Useful for communication and screening, but risk matrices can rank risks inconsistently and should not be the only tool.
どのように研究され、手法が言えないことは何か。
Where this page’s references lead.
このページの読解の基準となる機関と文書。状態と版は変わります。各リンクは発行機関へ移動します。
質問と回答。
Are risk matrices reliable?
What is structured expert judgement?
When should risk be quantified?
Are quantitative methods always better?
What is wrong with risk matrices?
How should uncertainty be communicated?
このページからエビデンスを提供する。
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