Table 1.

Loadings of the first six PCs by our method on the pitprops data

Variables	PC1	PC2	PC3	PC4	PC5	PC6
topdiam	−0.471	0	0.197	0	0	0
length	−0.484	0	0.222	0	−0.045	0
moist	0	−0.684	0	0.060	0.261	0
testsg	0	−0.659	−0.072	0.063	0.189	−0.121
ovensg	0	0	−0.745	0	0	−0.455
ringtop	−0.134	0	−0.400	0	−0.137	0.345
ringbut	−0.383	0	−0.110	0	−0.139	0.299
bowmax	−0.254	0.137	0	−0.092	0	−0.679
bowdist	−0.383	0	0	0	−0.080	0
whorls	−0.410	0.163	0	0.035	0	0
clear	0	0	0	−0.978	−0.040	−0.091
knots	0	−0.229	0	0	−0.921	−0.318
diaknot	0	0	0.424	0.163	0	0
Variance(%)	0.301	0.156	0.132	0.078	0.065	0.046
Cum. var.(%)	0.301	0.457	0.589	0.666	0.731	0.778