NPCirc: An R package for nonparametric circular methods

Nonparametric density and regression estimation methods for circular data are included in the r package npcirc. specifically,a circular kernel density estimation procedure is provided,jointly with different alternatives for choosing the smoothing parameter. in the regression setting,nonparametric estimation for circular-linear,circular-circular and linear-circular data is also possible via the adaptation of the classical nadaraya-watson and local linear estimators. in order to assess the significance of the features observed in the smooth curves,both for density and regression with a circular covariate and a linear response,a sizer technique is developed for circular data,namely circsizer. some data examples are also included in the package,jointly with a routine that allows generating mixtures of different circular distributions. © 2014,american statistical association. all right reserved.