Table 3: Evaluation of different interpolation kernels function.

Kernel function
ExponentialGaussianQuarticEpanechnikovPolynomial-5Constant

Regression function
Mean138314211378141213551428
Root mean square425142574250425742534266
Mean standardized0.00650.00670.00650.00660.00640.0067
Root mean square standardized0.02010.02010.02020.02010.02020.0200
Average standard error211114211797210334211526209641212674