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Changelog

Source: NEWS.md

risdr 0.3.1

CRAN release: 2026-07-28

CRAN release candidate

  • Added executable examples for the principal simulation, covariance, sufficient dimension reduction, prediction, slicing, structural dimension, and subspace-assessment workflows.
  • Hardened dependency, metadata, URL, spelling, and citation records for the first CRAN submission.
  • Declared both knitr and rmarkdown as vignette builders so that vignettes rebuild correctly when suggested packages are not pre-installed.
  • Added a package spelling dictionary and R-hub validation workflow.
  • Corrected structural-dimension examples to request an admissible maximum dimension directly, avoiding expected dimension-reduction warnings.
  • Excluded the repository-level CITATION.cff file from source-package builds while retaining inst/CITATION for the installed R package.
  • Retained the Zenodo DOI as the permanent identifier for the archived version 0.3.0 release and made the installed-package citation report the installed package version.
  • Completed local, GitHub Actions, pkgdown, coverage, URL, spelling, and selected R-hub checks successfully.

risdr 0.3.0

Package interface

  • Promoted repeated predictive cross-validation and complexity-aware cross-validation to the exported API.
  • Added explicit cov_args, stabilization_args, and sdr_args controls to prevent component arguments from leaking into unrelated functions.
  • Improved prediction for one-row inputs, reordered named columns, and alternative structural dimensions.
  • Restricted the real-data workflow to its verified continuous-response scope.

Numerical and validation changes

  • Added ridge and Ledoit-Wolf covariance methods to central method validation.
  • Replaced the observation-wise Ledoit-Wolf accumulation loop with an algebraically equivalent vectorised calculation.
  • Vectorised the principal Hessian directions kernel calculation.
  • Strengthened integer, missing-value, covariance, slice, survival-indicator, and resampling validation.
  • Corrected rho = 0 handling for AR(1) simulation and guarded sparse-basis generation when the predictor dimension is small.
  • Added a user-supplied true-basis option and ensured that simulated training and test samples share the same central subspace.
  • Made projection matrices robust to non-orthonormal full-rank bases.
  • Return NA with a warning when MAPE is undefined because an observed value is zero.

Documentation and release engineering

  • Added five vignettes, a structured pkgdown configuration, a professional README, contribution guidance, issue templates, and release documentation.
  • Expanded the testthat suite across validation, covariance estimation, SDR kernels, prediction, dimension selection, resampling, simulation, plotting, and real-data helpers.
  • Added multi-platform R CMD check, test coverage, and pkgdown workflows.
  • Added selected supplied thesis outputs under inst/extdata as provenance fixtures. Legacy simulation prediction outputs are explicitly marked for targeted rerun because the original script regenerated the true basis in the test sample.
  • Added the supplied aligned EPI training and test matrices, with dimensions, column alignment, and SHA-256 provenance recorded in inst/extdata/README.md.
  • Added a configurable corrected reproduction script for Simulations A, B1, and B2. Corrected files use distinct names and do not overwrite legacy outputs.

Compatibility

  • The principal user-facing function names from the supplied baseline are retained.
  • Version metadata now records the agreed development release number, 0.3.0.