Time-Series Regression Model for Prediction of Mean Daily Global Solar Radiation in Al-Ain, UAE

Table 6

Ljung-Box test for ARMA (4, 3) model for 𝛼=0.05 and DF =𝐾−(𝑝+𝑞).

Lags (𝐾)	12	16	18	20	24	36	48
DF	5	9	11	13	17	29	41
χ ^2 (DF, α)	11.070	16.919	19.675	22.362	27.587	42.557	56.942
𝑄 Statistic	7.481	9.611	10.916	11.488	11.940	26.656	35.392
𝑃-value	0.187	0.383	0.450	0.570	0.804	0.590	0.718