# --------------------------------------------
# CITATION file created with {cffr} R package
# See also: https://docs.ropensci.org/cffr/
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cff-version: 1.2.0
message: 'To cite package "NPCirc" in publications use:'
type: software
license: GPL-2.0-or-later
title: 'NPCirc: Nonparametric Circular Methods'
version: 3.2.1
identifiers:
- type: doi
  value: 10.32614/CRAN.package.NPCirc
abstract: Nonparametric smoothing methods for density and regression estimation and
  inference with circular data. The package provides kernel density estimation along
  with inferential tools such as circular SiZer for feature significance, mode estimation,
  and modal clustering. It includes multiple methods for selecting the smoothing parameter,
  allowing users to optimize the trade-off between bias and variance. Various plotting
  functions help visualize estimated densities, modes, clusters, and significance
  features. For regression, the package implements nonparametric estimation of the
  mean regression function as well as other conditional characteristics, including
  modal regression and generalized regression. Bandwidth selection is also supported
  in the regression context, and testing procedures are available to assess structural
  features or effects in circular regression models.
authors:
- family-names: Alonso-Pena
  given-names: Maria
  email: mariaalonso.pena@usc.es
- family-names: Oliveira
  given-names: Maria
- family-names: Ameijeiras-Alonso
  given-names: Jose
- family-names: Crujeiras
  given-names: Rosa M.
- family-names: Gijbels
  given-names: Irene
- family-names: Rodriguez-Casal
  given-names: Alberto
preferred-citation:
  type: manual
  title: 'NPCirc: An R Package for Nonparametric Circular Methods'
  authors:
  - family-names: Alonso-Pena
    given-names: Maria
    email: mariaalonso.pena@usc.es
  - family-names: Oliveira
    given-names: Maria
  - family-names: Ameijeiras-Alonso
    given-names: Jose
  - family-names: Crujeiras
    given-names: Rosa M.
  - family-names: Gijbels
    given-names: Irene
  - family-names: Rodriguez-Casal
    given-names: Alberto
  - family-names: Scapini
    given-names: Felicita
  institution:
    name: R package version 3.1.1
  notes: Completely revised and updated version of NPCirc with new methods and documentation.
  url: https://CRAN.R-project.org/package=NPCirc
repository: https://maria-alonsopena.r-universe.dev
commit: 717eade90eabac87c95b3eee77081d0d9b627b00
url: https://www.jstatsoft.org/v61/i09/
date-released: '2026-02-19'
contact:
- family-names: Alonso-Pena
  given-names: Maria
  email: mariaalonso.pena@usc.es
references:
- type: article
  title: 'NPCirc: An R Package for Nonparametric Circular Methods'
  authors:
  - family-names: Oliveira
    given-names: Maria
  - family-names: Crujeiras
    given-names: Rosa M.
  - family-names: Rodriguez-Casal
    given-names: Alberto
  journal: Journal of Statistical Software
  year: '2014'
  volume: '61'
  issue: '9'
  doi: 10.18637/jss.v061.i09
  url: https://www.jstatsoft.org/v61/i09/