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Table 5 Correlation between the leaf color parameters and the SPAD values for each of the constructed models

From: Skewed distribution of leaf color RGB model and application of skewed parameters in leaf color description model

Model

R2

Adjusted R2

SSE

RMSE

Prediction sample

Eliminate abnormal

Predictive accuracy (%)

Standard deviation

F1

0.583

0.581

7168

6.017

168

8

78.17

0.1832

F2

0.694

0.689

5260

5.181

168

16

79.36

0.1976

F3

0.648

0.643

6048

5.555

168

13

64.42

0.2320

F4

0.719

0.705

4870

5.050

168

11

82.15

0.1732

  1. The R2, adjusted R2, SSE, RMSE, predictive accuracy and standard deviation were compared for the four models (F1 − F4). Predictive accuracy = (1 − | predictive value-measured value |/measured) × 100%