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

Table 5

Variance analysis of HDFC relative dynamic modulus regression model.

Source	Sum of squares	Df	Mean square	F value	value
Model	545.09	9	60.57	28.29	0.0001
A	0.33	1	0.33	0.16	0.7054
B	5.80	1	5.80	2.71	0.1438
C	465.74	1	465.74	217.56	＜0.0001
AB	5.24	1	5.24	2.45	0.1615
AC	1.92	1	1.92	0.90	0.3754
BC	0.46	1	0.46	0.21	0.6585
A^2	6.04	1	6.04	2.82	0.1368
B^2	0.79	1	0.79	0.37	0.5637
C^2	59.99	1	59.99	28.02	0.0011
Residual	14.98	7	2.14	-	-
Pure error	2.77	3	4.07	5.87	0.0601