Experimental Study on Lateral Resolution of Phased Array Ultrasonic Testing of Irregular Structure Weld Defects

Table 7

Analysis of variance of interactive factors.

Dependent variable: Y
Source	Sum of squares	Df	Mean square	F value	P value
Model	44.359a	8	5.545	332.694	<0.0001	Significant
X1	4.351	1	4.351	261.075	0.0001
X2	0.061	1	0.061	3.675	<0.0001
X3	3.251	1	3.251	195.075	<0.0001
X1X2	0.011	1	0.011	0.675	0.0031
X1X3	0.451	1	0.451	27.075	0.0046
X2 X3	25.21	1	25.21	1512.30	<0.0001
X1X2X3	4.50	1	4.5	270.00	0.0005
Curvature	8.40	1	8.40	504.10	0.0002
Pure error	0.0500	3	0.0167
Cor total	96.73	11
A. R^2 = .9994(Adj. R^2 = .9981)