Table 8.

The fitting results for wind power output with different degree i. The eight-degree polynomial with the highest correlation coefficient R² = 0.9932 is selected as the best model for wind power output. For nine-degree polynomial, its correlation coefficient higher slightly than that of eight-degree polynomial, but the coefficient a₉ is zero.

	i = 3	4	5	6	7	8	9	10
a0	190.9752	300.1130	50.3861	− 71.7432	− 29.7084	8.2388	0.9578	− 9.6752
a1	− 269.9311	− 382.1442	− 22.8256	233.5924	103.3182	− 73.2569	− 23.2012	83.4538
a2	83.2476	117.1197	− 36.9182	− 191.5619	− 85.8043	100.0191	34.3568	− 136.7091
a3	− 3.8966	− 7.6637	19.2781	58.9500	22.0650	− 61.4883	− 24.9013	91.1207
a4		0.1333	− 1.8654	− 6.6945	− 0.2396	19.1791	8.4253	− 33.6795
a5			0.0517	0.3245	− 0.2651	− 2.7679	− 0.9466	8.0854
a6				− 0.0057	0.0210	0.2006	0.0175	− 1.1788
a7					− 0.0005	− 0.0072	0.0036	0.1022
a8						0.0001	− 0.0002	− 0.0051
a9							0.0000	0.0001
a10								0.0000
R2	0.9851	0.9864	0.9915	0.9928	0.9930	0.9932	0.9933	0.9933

The results of the best model are in bold