Comparison of regression line slopes and confidence intervals for five tree species in established north-central Florida parking lots.
| Slope of regression line ± 95% confidence interval Relationship in regression analysis | |||
|---|---|---|---|
Dependent variable Independent variable | Canopy radius dbh | Tree height dbh | Canopy radius Pavement opening |
| Species | |||
| Platanus occidentalis | 0.130 ± 0.010 | 0.306 ± 0.048 | 27.2 ± 9.9* |
| Ulmus parvifolia | 0.135 ± 0.010 | 0.183 ± 0.017 | 0.166 ± 0.056 |
| Quercus shumardii | 0.099 ± 0.023 | 0.173 ± 0.067 | 0.085 ± 0.036 |
| Quercus laurifolia | 0.111 ± 0.017 | 0.180 ± 0.047 | 0.166 ± 0.260** |
| Quercus virginiana | 0.096 ± 0.008 | 0.107 ± 0.015 | 0.003 ± 0.043*** |
↵* The regression relationship is based on a log transformation.
↵** Variability in data and limited replication produce a confidence interval that includes a zero or negative slope.
↵*** No relationship is reported between radius and opening for Q. virginiana due to a zero slope and high variability despite over 200 observations.