Application of Multiple Linear Regression Models and Artificial Neural Networks on the Surface Ozone Forecast in the Greater Athens Area, Greece

Table 2

Nonmulticollinearity test results between the three independent variables.

Combination of the independent variables	Multiple correlation coefficient	VIF
𝑥1=𝑓(𝑥2,𝑥3)	0.516	2.1
𝑥2=𝑓(𝑥1,𝑥3)	0.509	2.0
𝑥3=𝑓(𝑥1,𝑥2)	0.028	1.0