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

Table 5

Ljung-Box test for ARMA (2, 1) model for 𝛼=0.05 and DF =𝐾−(𝑝+𝑞).

Lags (𝐾)	12	16	18	20	24	36	48
DF	9	13	15	17	21	33	45
χ ^2 (DF, α)	16.919	22.362	24.996	27.587	32.671	47.400	61.656
Q Statistic	12.564	14.729	15.471	15.711	16.560	36.200	46.741
𝑃-value	0.183	0.325	0.418	0.544	0.735	0.322	0.401