Evaluate conservation outcomes and adverse effects.
Inputs, example and sources
World Bank · Impact Evaluation in Practice Second Edition
Institution publication · Chapter 7, table 7.2, printed page 140, PDF page 170
The formula is verified. Causal interpretation still requires a defensible study design, comparison and assumptions.
Keep the same place, observation period, definitions, units and source versions.
Analysis inputs. Treatment Comparable habitat-condition indicator before [specified condition unit]; Treatment Comparable habitat-condition indicator after [specified condition unit]; Comparison Comparable habitat-condition indicator before [specified condition unit]; Comparison Comparable habitat-condition indicator after [specified condition unit]; Study design and comparability evidence; Outcome definition, method and reference basis
Other required evidence. Intervention; baseline condition; follow-up; comparison sites; pressures; uncertainty.
Fictional worked example · 2025
Laggala Pallegama — conservation effectiveness · Laggala Pallegama
| Input or result | Value | Unit |
|---|
| Treatment Comparable habitat-condition indicator before | 42 | specified condition unit |
| Treatment Comparable habitat-condition indicator after | 59 | specified condition unit |
| Comparison Comparable habitat-condition indicator before | 39 | specified condition unit |
| Comparison Comparable habitat-condition indicator after | 46 | specified condition unit |
| Study design and comparability evidence | Missing | |
| Outcome definition, method and reference basis | Comparable habitat-condition indicator /example matching definition1 | |
| Difference in changes | 10 | specified condition unit |
|---|
The arithmetic alone does not establish causation. Design, parallel trends, confounding, attrition, uncertainty and adverse effects need appropriate evidence.
Proposed checking role. Wildlife ecologist, protected-area manager and veterinary specialist where needed.
After the action. Verified outcomes, costs, distributional effects and evidence strength.
- World Bank Impact Evaluation in Practice Second Edition — Institution publication. Chapter7 difference-in-differences. Published difference-in-differences estimator and study assumptions; aggregate examples do not establish causation.
- SHARED domain decision contracts — Validation required. Domain decision rules and matching fictional examples. Local comparisons, constraints, source matching, sorting and follow-up proposals; developer checks do not establish scientific or client approval.
Institution and data context
- Wildlife research permissions — Government publication. Full method locator not established. Institutional context; does not establish the calculation or local approval.
- Wilpattu management plan 2019–2024 — Institution publication. Wilpattu National Park Management Plan 2019-2024: approval page and executive summary. Institutional context; does not establish the calculation or local approval.
- GBIF guide for publishing biological survey and monitoring data — Institution publication. Guide v1.0.2: sections 5.4, 5.5 and 5.7 on time, protocol and sampling effort. Institutional context; does not establish the calculation or local approval.
Confirm local scope, data rights, parameters and responsible roles in this Institution review. Published components retain their source; they do not approve the local application.