# --------------------------------------------
# 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 "np" in publications use:'
type: software
license: GPL-1.0-only
title: 'np: Nonparametric Kernel Smoothing Methods for Mixed Data Types'
version: 0.70-3
doi: 10.18637/jss.v027.i05
identifiers:
- type: doi
  value: 10.32614/CRAN.package.np
abstract: Nonparametric (and semiparametric) kernel methods that seamlessly handle
  a mix of continuous, unordered, and ordered factor data types. We would like to
  gratefully acknowledge support from the Natural Sciences and Engineering Research
  Council of Canada (NSERC, <https://www.nserc-crsng.gc.ca/>), the Social Sciences
  and Humanities Research Council of Canada (SSHRC, <https://www.sshrc-crsh.gc.ca/>),
  and the Shared Hierarchical Academic Research Computing Network (SHARCNET, <https://sharcnet.ca/>).
  We would also like to acknowledge the contributions of the GNU GSL authors. In particular,
  we adapt the GNU GSL B-spline routine gsl_bspline.c adding automated support for
  quantile knots (in addition to uniform knots), providing missing functionality for
  derivatives, and for extending the splines beyond their endpoints.
authors:
- family-names: Racine
  given-names: Jeffrey S.
  email: racinej@mcmaster.ca
- family-names: Hayfield
  given-names: Tristen
  email: tristen.hayfield@gmail.com
preferred-citation:
  type: article
  title: 'Nonparametric Econometrics: The np Package'
  authors:
  - family-names: Hayfield
    given-names: Tristen
    email: tristen.hayfield@gmail.com
  - family-names: Racine
    given-names: Jeffrey S.
    email: racinej@mcmaster.ca
  journal: Journal of Statistical Software
  year: '2008'
  volume: '27'
  issue: '5'
  url: https://www.jstatsoft.org/index.php/jss/article/view/v027i05
  doi: 10.18637/jss.v027.i05
  start: 1-32
repository: https://cran.r-universe.dev
repository-code: https://github.com/JeffreyRacine/R-Package-np
commit: c3be8b5ff90ef242580b60407f8fb1fd2cc18240
url: https://github.com/JeffreyRacine/R-Package-np
date-released: '2026-06-01'
contact:
- family-names: Racine
  given-names: Jeffrey S.
  email: racinej@mcmaster.ca