# -------------------------------------------- # CITATION file created with {cffr} R package # See also: https://docs.ropensci.org/cffr/ # -------------------------------------------- cff-version: 1.2.0 message: 'To cite package "tptest" in publications use:' type: software license: GPL-3.0-only title: 'tptest: Universal Turning Point and Inflection Point Tests' version: 1.0.3 doi: 10.32614/CRAN.package.tptest identifiers: - type: doi value: 10.32614/CRAN.package.tptest abstract: 'Performs turning point and inflection point tests for U-shaped and inverse U-shaped relationships in regression models. Implements the Sasabuchi (1980) test as extended by Lind and Mehlum (2010) with support for quadratic, cubic, log-quadratic, and inverse functional forms. Features include delta-method standard errors, Fieller confidence intervals, Simonsohn (2018) two-lines test, and parametric bootstrap. Designed for post-estimation analysis of linear models, panel models, and quantile regression. References: Lind and Mehlum (2010) ; Sasabuchi (1980); Fieller (1954) .' authors: - family-names: Alkhalaf given-names: Muhammad email: muhammedalkhalaf@gmail.com orcid: https://orcid.org/0009-0002-2677-9246 preferred-citation: type: manual title: Universal Turning Point and Inflection Point Tests authors: - family-names: Alkhalaf given-names: Muhammad Abdullah email: muhammedalkhalaf@gmail.com orcid: https://orcid.org/0009-0002-2677-9246 year: '2026' notes: R package version 1.0.3 url: https://CRAN.R-project.org/package=tptest doi: 10.32614/CRAN.package.tptest repository: https://muhammedalkhalaf.r-universe.dev repository-code: https://github.com/muhammedalkhalaf/tptest commit: 68e0624b338834c0e04d4285b259654139500309 url: https://github.com/muhammedalkhalaf/tptest date-released: '2026-03-07' contact: - family-names: Alkhalaf given-names: Muhammad email: muhammedalkhalaf@gmail.com orcid: https://orcid.org/0009-0002-2677-9246