Multiple regressions and coefficients relating basal area growth since topping (G) with percent of crown remaining after topping (H) and diameter breast high (D), and levels of significance.
Species | Multiple regression equation | Multiple regression coefficient | Simple correlations (r-values) | ||
---|---|---|---|---|---|
H,G | D2,G | D2,H | |||
Beech, | |||||
American | G = 0.0242+ 0.00032D2 + 0.00008H | 0.69** | 0.004 | 0.685** | −0.048 |
Hickory | G = 0.0286 + 0.0001 8D2 − 0.00002H | 0.62* | −0.049 | 0.624** | −0.071 |
Oak, chestnut | G = 0.0035 + 0.00019D2 + 0.00086H | 0.59** | 0.458** | 0.514** | 0.347 |
Oak, n. red | G = 0.0324 + 0.00034D2 + 0.00068H | 0.54** | 0.146 | 0.545** | 0.248 |
Oak, white | G = 0.0425 + 0.00012D2 − 0.00007H | 0.48* | 0.012 | 0.483* | −0.040 |
Pine, Virginia | G = 0.0431 + 0.00049D2 − 0.00039H | 0.76** | −0.179 | 0.690** | 0.206 |
Sweetgum | G = 0.0198 + 0.00037D2 − 0.00003H | 0.77** | −0.057 | 0.775** | −0.034 |
Sycamore | G = −0.083 + 0.00054D2 + 0.00179H | 0.95* | −0.175 | 0.935** | −0.353 |
Yellow-poplar | G = 0.0365 + 0.00031 D2 + 00339H | 0.57** | 0.521** | 0.256 | 0.051 |