Table 4.
Fitted constant (a) and coefficient (b) of the models used to estimate the loquat leaf area (LA in cm2) of single leaves from leaf length (L) and leaf width (W) measurements. The standard errors and p-value in parenthesis; L and W were in cm. All data were derived from the calibration Experiment 2015 (n = 1890 leaves).
| Model No. | Form of the Model Tested | Fitted Coefficient and Constant | R2 | RMSE | BIC | PRESS | SSE | Bias (PRESS-SSE) |
|
|---|---|---|---|---|---|---|---|---|---|
| a (SE/p-Value) | b (SE/p-Value) | ||||||||
| 1 | LA = a + b × L | −83.292 (1.801/***) | 8.510 (0.087/***) | 0.836 | 16.14 | 15,664 | 486,356 | 484,990 | 1366 |
| 2 | LA = a × eb×L | 14.610 (0.291/***) | 0.086 (0.001/***) | 0.851 | 15.74 | 15,571 | 462,944 | 461,346 | 1598 |
| 3 | LA = a + b × L2 | 2.227 (0.901/*) | 0.203 (0.002/***) | 0.853 | 15.27 | 15,458 | 435,447 | 434,241 | 1206 |
| 4 | LA = a + b × W | −61.081 (1.321/***) | 23.575 (0.202/***) | 0.880 | 13.83 | 15,089 | 357,115 | 356,091 | 1024 |
| 5 | LA = a × eb×W | 19.217 (0.284/***) | 0.230 (0.002/***) | 0.878 | 13.82 | 15,087 | 357,303 | 355,669 | 1634 |
| 6 | LA = a + b × W2 | 14.025 (0.666/***) | 1.741 (0.014/***) | 0.894 | 12.98 | 14,854 | 314,867 | 313,948 | 919 |
| 7 | LA = a + b × (L × W) | −0.516 (0.321/ns) | 0.667 (0.002/***) | 0.980 | 5.614 | 11,732 | 58,879 | 58,694 | 185 |
Note: *** p < 0.001; * p < 0.05; ns = not significant; R2 = coefficient of determination; RMSE (cm2) = root mean squared error; BIC = Bayesian information criterion, PRESS = predicted residual error sum of squares; SSE = sum of squared error; Bias = differences between the PRESS and SSE values.