Alonso Pena, MaríaCrujeiras Casais, Rosa María2025-10-272025-10-272025-05-06Alonso-Pena, M., Crujeiras, R.M. (2025). A Review on Nonparametric Circular Regression. In: Kumar, S., Arnold, B.C., Shimizu, K., Laha, A.K. (eds) Directional and Multivariate Statistics. Springer, Singapore.978-981-96-2003-6https://hdl.handle.net/10347/43425Nonparametric regression models, involving circular variables (as responses and/or covariates) are revised in this chapter, focusing on a kernel approach. For linear response and circular covariate, both suitably adapted local polynomial and local likelihood models are introduced. The local polynomial approach is also presented for circular response regression. The use of these estimators for testing different hypotheses is also revised and their applicability is illustrated with a real data example. Finally, we provide some resources for the computation of the different tools.eng© 2023 Alonso-Pena, M. . and Crujeiras, R.M. Published by Springer. It may be used for non-commercial purposes in accordance with the publisher’s policy.Nonparametric regressionCircular dataFlexible regressionDirectional data120906 Métodos de distribución libre y no paramétricabook part10.1007/978-981-96-2004- 3_9embargoed access