Global Solar Radiation Models in Minas Gerais, Southeastern Brazil

Table 4

Mean and standard deviation related to global solar radiation observed and simulated by the empirical models in each location.

Location	Models	Mean (MJ·m^−2day^−1)		Standard deviation
		Obs.	Sim.	Obs.	Sim.
Araçuaí	Nw	18.40	17.65	4.12	2.95
	AE		17.50		2.96
	JS		18.13^ns		2.81
	Gd		18.25^ns		2.51
	EY		17.71		2.96
Araxá	Nw	18.60	18.14	3.69	3.95^ns
	AE		18.21		3.98^ns
	JS		17.68		3.82^ns
	Gd		18.35		3.57^ns
	EY		18.26		3.99^ns
Belo Horizonte	Nw	16.40	16.69^ns	3.58	2.62
	AE		16.70^ns		2.62
	JS		16.65^ns		2.73
	Gd		17.22		1.39
	EY		16.66^ns		2.63
Caratinga	Nw	16.30	16.49^ns	4.01	2.50
	AE		16.57^ns		2.53
	JS		16.57^ns		2.36
	Gd		16.86^ns		2.57
	EY		16.63^ns		2.54
Lavras	Nw	16.80	17.55^ns	3.89	4.43^ns
	AE		17.53^ns		4.42^ns
	JS		16.76^ns		3.98^ns
	Gd		17.30^ns		3.37^ns
	EY		17.65^ns		4.40^ns
Machado	Nw	17.20	16.45	3.78	4.07^ns
	AE		16.48^ns		4.12^ns
	JS		15.76		3.18
	Gd		16.39		3.16
	EY		16.43^ns		4.05^ns
Montes Claros	Nw	20.90	20.15^ns	3.60	3.84^ns
	AE		20.11^ns		3.92^ns
	JS		20.00		3.33^ns
	Gd		20.10		3.24^ns
	EY		20.16^ns		3.85^ns
Paracatu	Nw	19.20	19.78^ns	3.54	3.12^ns
	AE		19.73^ns		3.11^ns
	JS		19.31^ns		3.08^ns
	Gd		19.83^ns		2.32
	EY		19.86^ns		3.10^ns
Pirapora	Nw	17.60	19.17	4.12	3.70^ns
	AE		19.31		3.73^ns
	JS		19.00		3.10
	Gd		19.25		3.26
	EY		19.29		3.72^ns
Viçosa	Nw	15.10	15.41^ns	4.06	4.12^ns
	AE		15.39^ns		4.11^ns
	JS		15.70^ns		3.42
	Gd		15.96^ns		2.87
	EY		15.51^ns		4.11^ns

Obs.: observed values; Sim.: simulated values. ^nsNot significant; significant at 5% by the paired t-test (comparing the observed mean with each estimated mean) and by Bartlett’s test (comparing the observed variance with each simulated variance). The null hypothesis for the paired t-test is that means of the observed and estimated H_s must be equal (), and the alternative hypothesis is that means are unequal (). The null hypothesis for Bartlett’ test is homogeneous variances (), and the alternative hypothesis is heterogeneous variances ().