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

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 5 Variance analysis of kerf depth regression model

Variation source	Sum of squares	Freedom	Mean square	F value	P value
Model	2.9800	9	0.3310	469.93	< 0.0001
\(x_{1}\)	1.8600	1	1.8600	2644.45	< 0.0001
\(x_{2}\)	0.2520	1	0.2520	357.88	< 0.0001
\(x_{3}\)	0.4232	1	0.4232	600.89	< 0.0001
\(x_{1} x_{2}\)	0.0702	1	0.0702	99.71	< 0.0001
\(x_{1} x_{3}\)	0.0462	1	0.0462	65.63	< 0.0001
\(x_{2} x_{3}\)	0.0240	1	0.0240	34.11	0.00006
\(x_{1}^{2}\)	0.1817	1	0.1817	258.03	< 0.0001
\(x_{2}^{2}\)	0.0634	1	0.0634	90.08	< 0.0001
\(x_{3}^{2}\)	0.0288	1	0.0288	40.94	0.0004
Residual	0.0049	7	0.0007
Spurious term	0.0027	3	0.0009	1.55	0.3325
Error	0.0023	4	0.0006
The sum	2.9800	16