4 Nonparametric Regression
4.1 Univariate Kernel Regression
4.2 Other Smoothers
4.3 Smoothing Parameter Selection
4.4 Confidence Regions and Tests
4.4.1 Pointwise Confidence Intervals
4.4.2 Confidence Bands
4.4.3 Hypothesis Testing
4.5 Multivariate Kernel Regression