Research on the wood processing method of helium-assisted laser process

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table6 Variance analysis of surface roughness regression model

Variation source	Sum of squares	Freedom	Mean square	F value	P value
Model	4.7500	9	0.5282	1210.27	< 0.0001
\(x_{1}\)	2.9600	1	2.9600	6792.89	< 0.0001
\(x_{2}\)	0.6105	1	0.6105	1398.88	< 0.0001
\(x_{3}\)	0.2381	1	0.2381	545.45	< 0.0001
\(x_{1} x_{2}\)	0.0272	1	0.0272	62.38	< 0.0001
\(x_{1} x_{3}\)	0.0196	1	0.0196	44.91	0.0003
\(x_{2} x_{3}\)	0.0484	1	0.0484	110.90	< 0.0001
\(x_{1}^{2}\)	0.5151	1	0.5151	1180.15	< 0.0001
\(x_{2}^{2}\)	0.1437	1	0.1437	329.30	< 0.0001
\(x_{3}^{2}\)	0.1108	1	0.1108	253.98	< 0.0001
Residual	0.0031	7	0.0004
Spurious term	0.0008	3	0.0003	0.45	0.7292
Error	0.0023	4	0.0006
The sum	4.7600	16