Principal component scores based on nine tree response variables.zy Data from 84 trees in western suburban Chicago, IL.
| Principal component | ||
|---|---|---|
| PC1 ≈ size | PC2 ≈ growth | |
| Eigenvalue | 4.60 | 1.82 |
| Proportion | 50.09 | 20.25 |
| Cumulative proportion | 50.09 | 70.34 |
| Scores of two rotated eigenvectors | ||
| Age (yr) | 0.96y | −0.04 |
| Trunk diameter (cm) | 0.89y | 0.38 |
| Height (m) | 0.85y | 0.37 |
| Crown area (m2) | 0.80y | 0.47 |
| Leaf N (%) | 0.65y | 0.07 |
| Tree condition indexx | 0.26 | 0.59y |
| Leaf chlorophyll (SPAD) | 0.19 | 0.67y |
| Trunk diameter growth rate (mm yr−1) | 0.08 | 0.84y |
| Tree height growth rate (m yr−1) | −0.57y | 0.38 |
↵zOnly principal components (PC) with eigenvalues >1 and that explain >5% of the total variance were retained.
↵yIdentifies parameters with significant loadings on the within column principal component.
↵xTree condition index is a qualitative score of seven factor scores of growth, structure, pest, trunk, crown, root, and life.