Classification of wood surfaces according to visual appearance by multivariate analysis of wood feature data

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 3 Variables included or removed in the stepwise discriminant analysis for log-sector class 1

Step	Variables		F value	Minimum D ²
Step	Included	Removed	F value	Minimum D ²
1	Maximum sound knot size	–	860.412	63.482
2	Standard deviation of sound knot size	–	24.414	94.561
3	Simpson index of knot type	–	11.651	116.640
4	Number of sound knots	–	27.505	181.693
5	Relative total sound knot area	–	24.106	271.212
6	Mean sound knot size	–	12.168	339.550
7	–	Maximum sound knot size	1.347	330.357

The partial F value and minimum D ² indicated for each step are the values computed in the previous step that were the basis for variable inclusion or removal