# statsmodels.nonparametric.kernel_regression.KernelReg¶

class statsmodels.nonparametric.kernel_regression.KernelReg(endog, exog, var_type, reg_type='ll', bw='cv_ls', defaults=None)[source]

Nonparametric kernel regression class.

Calculates the conditional mean E[y|X] where y = g(X) + e. Note that the “local constant” type of regression provided here is also known as Nadaraya-Watson kernel regression; “local linear” is an extension of that which suffers less from bias issues at the edge of the support.

Parameters: endog (array-like) – This is the dependent variable. exog (array-like) – The training data for the independent variable(s) Each element in the list is a separate variable var_type (str) – The type of the variables, one character per variable: c: continuous u: unordered (discrete) o: ordered (discrete) reg_type ({'lc', 'll'}, optional) – Type of regression estimator. ‘lc’ means local constant and ‘ll’ local Linear estimator. Default is ‘ll’ bw (str or array_like, optional) – Either a user-specified bandwidth or the method for bandwidth selection. If a string, valid values are ‘cv_ls’ (least-squares cross-validation) and ‘aic’ (AIC Hurvich bandwidth estimation). Default is ‘cv_ls’. User specified bandwidth must have as many entries as the number of variables. defaults (EstimatorSettings instance, optional) – The default values for the efficient bandwidth estimation.
bw

The bandwidth parameters.

Type: array_like

Methods

 aic_hurvich(bw[, func]) Computes the AIC Hurvich criteria for the estimation of the bandwidth. cv_loo(bw, func) The cross-validation function with leave-one-out estimator. fit([data_predict]) Returns the mean and marginal effects at the data_predict points. loo_likelihood() r_squared() Returns the R-Squared for the nonparametric regression. sig_test(var_pos[, nboot, nested_res, pivot]) Significance test for the variables in the regression.