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- Table 1. Degree of correlation between four site variables and the growth Ratio Index (dbh/age). Summary of the PROC RSQUARE SAS procedure evaluating various combinations of models and the PROC GLM SAS procedure to determine the intercept (a) and the coefficients (b, c, d) of the selected models. These models were selected using the R2 value, Mallow’s C(p) statistic and the number of variables being considered within each model. Model form: GRI= a + b*(variable 1) + c*(variable 2) + d* (variable 3).
Model Intercept Variables R2 Cp #Obs. (coefficients) All 0.433** sdwk set cp (-0.001) (0.001) (0.018) 0.01 3.00 540 Acer platnoides 0.252** sdwk set cp** (-0.009) (0.001) (0.069)** 0.14** 3.05 79 Acer rubrum 0.308** sdwk** set ps (0.018)* (0.003) (-0.001) 0.14** 3.70 67 Acer saccharinum 0.510** ps cp (-0.002) (0.072) 0.04 1.92 51 Acer saccharum 0.404** sdwk ps cp (0.001) (0.003) (-0.005) 0.01 3.00 65 Fraxinus sp. 0.505** sdwk set cp (-0.006) (0.003) (-0.044) 0.09* 3.00 61 Gleditsia Triacanthos 0.289** sdwk set cp* (0.008) (0.001) (0.092) 0.14** 3.40 47 Platanus x acerifolia 0.416** sdwk set cp (0.007) (0.0005) (0.055) 0.05 3.09 67 Quercus palustris 0.885** sdwk set cp (0.005) (-0.004) (-0.066) 0.07* 3.04 66 Tilia sp. 0.529** sdwk set cp* (0.007) (0.002) (0.089) 0.14* 3.02 37
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