Make Symmetric and Asymmetric ARDL Estimations R package kardl version 2.0.5 Implements estimation procedures for Autoregressive Distributed Lag (ARDL) and Nonlinear ARDL (NARDL) models, which allow researchers to investigate both short- and long-run relationships in time series data under mixed orders of integration. The package supports simultaneous modeling of symmetric and asymmetric regressors, flexible treatment of short-run and long-run asymmetries, and automated equation handling. It includes several cointegration testing approaches such as the Pesaran-Shin-Smith F and t bounds tests, and narayan test. Methodological foundations are provided in Pesaran, Shin, and Smith (2001) <doi:10.1016/S0304-4076(01)00049-5> and Shin, Yu, and Greenwood-Nimmo (2014, ISBN:9780123855079). Software Depends: R (>= 3.5.0) Imports: stats, msm, lmtest,lifecycle, nlWaldTest, car, ggplot2, utils Suggests: knitr, rmarkdown, magrittr, rlang, tidyr, dplyr, MASS, sandwich, testthat (>= 3.0.0) Huseyin karamelikli <hakperest@gmail.com> Comprehensive R Archive Network (CRAN) Huseyin karamelikli [aut, cre] (ORCID: <https://orcid.org/0000-0001-7622-0972>), Huseyin Utku Demir [aut] (ORCID: <https://orcid.org/0000-0002-9140-0362>) GPL-3 2026-07-22 application/tgz https://CRAN.R-project.org/package=kardl doi:10.32614/CRAN.package.kardl