NEWS

---

QuadratiK 1.2.0

MINOR IMPROVEMENTS

• The function select_h can be now used also for the normality test. The parameters mu and sigma are mandatory.
  • The skewness alternative is no longer supported for normality tests in select_h and kb.test functions.

DOCUMENTATION FIXES

• The arguments of the class object pk.test have been renamed to match the terminology in the article by Ding, Markatou, Saraceno (2025) Statistica Sinica. Un and Vn statistics are now renamed to Tn and Sn respectively.
  • In the functions select_h and kb.test, the arguments mu_hat and sigma_hat have been renamed to mu and sigma for consistency.
  • Examples in the documentation have been changed accordingly.
  • Code testing has been updated accordingly.

QuadratiK 1.1.4

BUG FIXES

• Change computation of the M-step in the pkbc algorithm to handle larger dimensions
  • Improve pkbc function for reducing the computational time required

QuadratiK 1.1.3 (2025-02-04)

NEW FEATURES

• the function rpkb() returns directly the generated data set and not a list.
  • change repository name from QuadratiK-package to QuadratiK.

MINOR IMPROVEMENTS

• packages ggplot2 and foreach not called as full packages but using importFrom.
  • nClust argument of pkbc function has no default value.
  • usage of standardGeneric (see https://adv-r.hadley.nz/s4.html#s4-generics).

BUG FIXES

• goodpractice suggestions.
  • specify that rho in pk.test() cannot be equal 1.
  • styling and spelling errors.

DOCUMENTATION FIXES

• Uniform notation: d is dimension in Eucldean space with spherical data lying on the (d-1)-dimensional sphere
  • Specify dimension of input matrix x in clustering functions.
  • Improve explanation of Average Silhouette Width.
  • Better explanation of motivation for L2 normalization in the wireless data set application.

QuadratiK 1.1.2 (2024-10-29)

NEW FEATURES

• Added NEWS.md file.

  • More detailed information in the README file and documentation (the methods are more usable and clearer for a broader audience).

MINOR IMPROVEMENTS

• Added badges for rOpenSci review status, test coverage, R CMD CHECK, CRAN downloads.
  • Addition of test codes with testthat package.
  • In particular, testing that random sampling from the PKBD and the wrapped Cauchy distribution is equivalent.

BUG FIXES

• scatter-plots related to the clustering algorithm results.
  • computation of evaluation measures (pkdc_validation function) when the true labels are not provided.

DOCUMENTATION FIXES

• The help documentation for the methods defined for the classes in the package can be accessed directly (addition of roxygen tag name and aliases).

QuadratiK 1.1.1 (2024-06-05)

NEW FEATURES

• Improve computation of variance for k-sample test
  • Add breast_cancer and wine data sets

MINOR IMPROVEMENTS

• print() and summary() methods of the kb.test object for the two and k-sample tests

BUG FIXES

• Computation of test statistics for normality test

DOCUMENTATION FIXES

• Correction of typos

QuadratiK 1.1.0 (2024-05-14)

NEW FEATURES

• Add GitHub links to the DESCRIPTION file
  • Add unit tests
  • Add CONTRIBUTING.md
  • Add srr standards for the categories: General, Clustering and Probability Distributions
  • Add methods for the clustering object pkbc: show(), summary(), estract_stats(), plot() and predict()
  • Add vignette generate_rpkb.Rmd
  • Add CODE_OF_CONDUCT.md
  • Create the GitHub page using pkgdown
  • Add V-statistic for Normality test, with corresponding Critical Value and Degrees of Freedom with the function DOF_norm()
  • Update kb.test S4 class slots, kb.test() function, unit-test codes, summary() and print() method for including the V-statistic
  • Add Trace statistic for two and k-sample tests
  • Add computation of the Variance for two and k-sample tests

MINOR IMPROVEMENTS

• Addition of GitHub workflows for R-CMD-check, test-coverage and pkgcheck
  • Update codes to check arguments of function pk.test()
  • Update codes to check arguments of function kb.test() and select_h()
  • Modify indentation and assignments (using '<-') following goodpractice standards
  • Update references in README.md file

BUG FIXES

• Add codemeta.json to .Rbuildignore

  • Add CONTRIBUTING.md to .Rbuildignore

  • Fix warning from internal function compare_qq()

  • Add doc folder to .gitignore

  • Modify returned test statistics multiplying them by the sample size

  • Remove "Nonparam" centering option for the Normality test

  • Critical value of the V-statistic divided by the variance in the function pk.test()

DEPRECATED AND DEFUNCT

• summary_stat() and validation() substituted by estract_stats() and pkbc_validation()

DOCUMENTATION FIXES

• C++ functions are set as internal functions
  • Correction of typos
  • Remove Date from DESCRIPTION
  • Update References in the DESCRIPTION file

QuadratiK 1.0.0 (2024-02-23)

NEW FEATURES

• released to CRAN