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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%