Study of the Frost Resistance of HDFC Based on a Response Surface Model and GM (1,1) Model

Table 9

GM (1,1) model accuracy prediction table.

Critical value of the index	The relative dynamic elastic modulus prediction accuracy of GM (1,1) model
	HDFC 0–0	HDFC 6–1	HDFC 6–1.5	HDFC 6–2	HDFC 9–1			HDFC 9–1.5	HDFC 9–2		HDFC 12–1	HDFC 12–1.5	HDFC 12–2
C	0.16	0.21	0.12	0.15		0.11	0.19			0.07	0.15	0.12	0.33
P	1.00	1.00	1.00	1.00		1.00	1.00			1.00	1.00	1.00	1.00
	0.9803	0.9731	0.9816	0.9763		0.9915	0.9756			0.9941	0.9833	0.9863	0.9658
(%)	2.00	2.70	1.90	2.20		0.79	2.20			0.76	1.80	1.40	4.30