A Simple Tool to Identify Representative Wind Sites for Air Pollution Modelling Applications

Table 2

Model evaluation statistics and their definitions.

Name	Symbol	Definition
Normalized root mean squared error	NRMSE
Index of agreement	IA
Correlation coefficient	COR
Fractional bias	FB
Factor of two	FAC2	Fraction of data for which

Note. is the th predicted value, is the th observed value, is the maximum observed value, is the minimum observed value, is the number of observed and predicted pairs, is the mean predicted, is the mean observed, is the standard deviation over the observed data set, and is the standard deviation over the predicted data set.