Axial Compression Performance of Concrete-Filled Steel Tubular Columns with Different D/t Ratios

Table 3

Regression model’s analysis of variance (ANOVA) for experimental outcomes.

Source	Responses (Yfck − t)
	DF	F-value	P value
Model	5	56.96	0.000
Linear	2	138.33	0.000
X1	1	98.62	0.000
X2	1	178.04	0.000
Square	2	2.97	0.116
	1	0.00	0.004
	1	5.82	0.975
2-Way interaction	1	2.19	0.183
X1X2	1	2.19	0.183