Wavelet Quantile Regression Toolbox R package wqrr version 1.0.0 A comprehensive toolbox for wavelet-domain quantile analyses of bivariate and multivariate time series. Provides Wavelet Quantile Regression and Multivariate Wavelet Quantile Regression after Adebayo and Ozkan (2024) <doi:10.1016/j.jclepro.2024.140832>, Wavelet Quantile-on-Quantile regression with bootstrap p-values extending Sim and Zhou (2015) <doi:10.1016/j.jbankfin.2015.01.013>, the nonparametric Causality-in-Quantiles test of Balcilar, Gupta and Pierdzioch (2016) <doi:10.1016/j.resourpol.2016.04.004> together with its wavelet variant, Wavelet Quantile Mediation and Moderation, Wavelet Quantile Correlation, and a wavelet-based nonparametric Quantile Density estimator. The Maximal Overlap Discrete Wavelet Transform (MODWT) decomposition is performed via 'waveslim' and Short / Medium / Long band aggregation is supported throughout. For plain Quantile-on-Quantile regression see the companion CRAN package 'QuantileOnQuantile'. All interactive 3D surfaces, heatmaps and contour plots default to the 'MATLAB' 'Parula' colour map. Software Depends: R (>= 3.5.0) Imports: quantreg (>= 5.0), waveslim (>= 1.8), plotly (>= 4.0.0), stats, utils, grDevices Suggests: knitr, rmarkdown, testthat (>= 3.0.0) Merwan Roudane <merwanroudane920@gmail.com> Comprehensive R Archive Network (CRAN) Merwan Roudane [aut, cre, cph], Nicholas Sim [ctb] (Original Quantile-on-Quantile methodology), Hongtao Zhou [ctb] (Original Quantile-on-Quantile methodology), Tomiwa Sunday Adebayo [ctb] (Wavelet Quantile Regression methodology), Mehmet Balcilar [ctb] (Nonparametric quantile causality methodology) GPL-3 2026-06-08 application/tgz https://CRAN.R-project.org/package=wqrr doi:10.32614/CRAN.package.wqrr