Table I. Principal components analysis illustrating the high degree of correlation among the 40 wood properties used in the association testing.

The top three principal components (represented) explained 46% of the total variance in all wood properties analyzed. Loading values greater than 0.6 indicate strong correlations within components and are presented in boldface underlined numbers to assist with interpretation; strong negative correlations within component 3 are presented in italic underlined numbers.

Full Name	Abbreviated Name	Component
		1	2	3
Lignin percentage	LIG	−0.49	−0.14	0.64
Lignin syringyl and guaiacyl ratio	S/G ratio	0.16	−0.03	−0.42
Cellulose percentage	CEL	0.60	0.12	−0.72
Screened pulp yield	SPY	0.41	0.10	−0.77
Total pulp yield	TPY	0.40	0.10	−0.72
Glucose percentage	GLC	0.74	0.05	−0.52
Arabinose percentage	ARA	0.34	−0.24	0.55
Galactose percentage	GAL	0.34	0.02	−0.14
Mannose percentage	MAN	−0.59	0.08	0.42
Xylose percentage	XYL	−0.35	0.11	0.34
Average air-dry density	ADDenkgm3	0.71	−0.15	0.50
Core basic density	CBD	0.34	−0.24	0.42
Disc bulk density, outer wood (kg m−3)	DiscBDa	0.20	−0.25	0.23
Disc bulk density, intermediate wood (kg m−3)	DiscBDb	0.39	−0.43	0.43
Disc bulk density, inner wood (kg m−3)	DiscBDc	0.59	−0.41	0.50
Director velocity squared (km2 s−2)	DirVel2	0.62	−0.25	−0.21
FAKOPP velocity squared (km2 s−2)	FAKOPP2	0.71	−0.30	−0.06
Modulus of elasticity (MPa)	MOE	0.81	−0.23	0.12
Modulus of rupture (MPa)	MOR	0.69	−0.32	0.31
Average hardness (kn)	AvgHard	0.52	−0.35	0.46
Block average radial shrinkage at 17% moisture	BR17	0.26	0.59	0.29
Block average radial shrinkage at 12% moisture	BR12	0.37	0.46	0.29
Block average radial shrinkage at 5% moisture	BR5	0.32	0.46	0.16
Core radial scans at 12% moisture	CR12scans	0.21	0.34	0.01
Block average tangential shrinkage at 17% moisture	BT17	0.13	0.82	0.21
Block average tangential shrinkage at 12% moisture	BT12	0.16	0.79	0.19
Block average tangential shrinkage at 5% moisture	BT5	0.15	0.81	0.19
Core average tangential shrinkage at 17% moisture	CT17	0.29	0.77	0.15
Core average tangential shrinkage at 12% moisture	CT12	0.33	0.76	0.13
Core average tangential shrinkage at 5% moisture	CT5	0.37	0.76	0.14
Block tangential-radial shrinkage ratio	T/R block	−0.27	0.12	−0.13
Core tangential-radial shrinkage ratio	T/R core	−0.14	−0.04	0.08
Average collapse grade	AvColGr	−0.08	0.58	0.24
Average maximum collapse	AvMaxcol	−0.01	0.46	0.24
Diameter at breast height at 104 months	DBH104	0.19	−0.20	0.43
Height at 104 months	HT104	0.37	−0.08	0.25
Spiral grain	Spiral	−0.02	−0.03	0.03
Interlocking degree	Interlock	−0.05	−0.08	0.09
Average pith	AvPith	−0.15	−0.01	−0.07
Average heartwood	AvHw	0.02	−0.19	0.30
Percentage of variance		17%	−16%	13%
Cumulative percentage		17%	32%	46%