Statistical Analysis of Solar Radiation Data Using Cubic Spline Functions

A cubic spline-type model has been developed to analyze the avarage daily total solar radiation data. This model has been found to perform significantly better than the other regression-type models. In this study, cubic spline functions have been used to analyze the solar radiation data of 5 years from 1994 to 1998 for Izmir. The reliability of the model has also been tested with a statistical hypothesis.