Bump version to 2.8.1

CHANGELOG.md

@@ -7,6 +7,27 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [2.8.1] - 2026-04-01
+
+### Added
+- **Survey-aware DiD tutorial** (`docs/tutorials/16_survey_did.ipynb`) — Phase 7c complete. Full workflow with strata, PSU, FPC, replicate weights, subpopulation analysis, and DEFF diagnostics. Includes `generate_survey_did_data()` DGP function.
+- **Survey R cross-validation** — benchmark scripts and tests comparing TSL variance against R's `survey::svyglm()` for basic DiD and TWFE with full survey designs (strata, PSU, FPC). Committed JSON fixtures for CI without R.
+- **HonestDiD methodology review and validation** — 478 lines of methodology tests, paper review document, rewritten optimal FLCI with first-difference reparameterization.
+- **StaggeredTripleDifference survey support** — full `SurveyDesign` integration with strata/PSU/FPC, replicate weights, and survey-aware bootstrap.
+
+### Changed
+- HonestDiD: rewrite optimal FLCI with proper first-difference reparameterization and centrosymmetric LP optimization
+- HonestDiD: use `conf_int` from results instead of hardcoded `1.96*se` in event study plots
+- Survey tutorial cross-referenced from choosing_estimator.rst and quickstart.rst
+
+### Fixed
+- Fix HonestDiD identified set computation and inference (F1-F6 from Rambachan & Roth 2023)
+- Fix FLCI slope count (T not T-1) and constraint formula
+- Fix NaN CI misclassification as significant (P0 finding)
+- Fix M=0 linear extrapolation and survey df folded nct in REGISTRY.md
+- Fix replicate-weight scale invariance and BRR test fixtures
+- Fix JK1 populated-PSU guard and narrow warning filter
+
 ## [2.8.0] - 2026-03-31
 
 ### Added
@@ -1044,6 +1065,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - `to_dict()` and `to_dataframe()` export methods
   - `is_significant` and `significance_stars` properties
 
+[2.8.1]: https://github.com/igerber/diff-diff/compare/v2.8.0...v2.8.1
 [2.8.0]: https://github.com/igerber/diff-diff/compare/v2.7.6...v2.8.0
 [2.7.6]: https://github.com/igerber/diff-diff/compare/v2.7.5...v2.7.6
 [2.7.5]: https://github.com/igerber/diff-diff/compare/v2.7.4...v2.7.5

diff_diff/__init__.py

@@ -210,7 +210,7 @@
 Bacon = BaconDecomposition
 EDiD = EfficientDiD
 
-__version__ = "2.8.0"
+__version__ = "2.8.1"
 __all__ = [
     # Estimators
     "DifferenceInDifferences",

docs/llms-full.txt

@@ -2,7 +2,7 @@
 
 > A Python library for Difference-in-Differences causal inference analysis. Provides sklearn-like estimators with statsmodels-style output for econometric analysis.
 
-- Version: 2.8.0
+- Version: 2.8.1
 - Repository: https://github.com/igerber/diff-diff
 - License: MIT
 - Dependencies: numpy, pandas, scipy (no statsmodels dependency)

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "maturin"
 
 [project]
 name = "diff-diff"
-version = "2.8.0"
+version = "2.8.1"
 description = "Difference-in-Differences causal inference with sklearn-like API. Callaway-Sant'Anna, Synthetic DiD, Honest DiD, event studies, parallel trends."
 readme = "README.md"
 license = "MIT"

rust/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "diff_diff_rust"
-version = "2.8.0"
+version = "2.8.1"
 edition = "2021"
 description = "Rust backend for diff-diff DiD library"
 license = "MIT"