Linear mixed model of the crown radius in m of all analyzed trees (response variable), with the individual tree code as random effect and fixed effects area of the tree pit related to the intercardinal direction factor.
| Parameter | Fixed effect | Value ± SD | P |
|---|---|---|---|
| a | Intercept | 4.02 ± 0.26 | < 0.001 |
| areaij | Tree Pit | 0.06 ± 0.02 | < 0.001 |
| directionNij | Direction N | −0.04 ± 0.06 | 0.01 |
| directionNEij | Direction NE | 0.04 ± 0.06 | 0.06 |
| directionNWij | Direction NW | −0.08 ± 0.06 | 0.06 |
| directionSij | Direction S | 0.05 ± 0.06 | 0.06 |
| directionSEij | Direction SE | 0.15 ± 0.05 | 0.06 |
| directionSWij | Direction SW | 0.04 ± 0.06 | 0.06 |
| directionWij | Direction W | −0.15 ± 0.06 | 0.06 |
| Random effect dij | 0.20 | - | |
| ε | 0.09 | - |
Levels of direction: 8 (E, N, NE, NW, S, SE, SW, W).
SD (standard deviation).