Table 2 Indexes for assessing the fitting of measured and predicted values of soluble sugar and starch contents.

From: Using electrical impedance tomography for rapid determination of starch and soluble sugar contents in Rosa hybrida

Item

Index

Regression model

RMSE

RE (%)

Offset

R'2

Soluble sugar

Boundary voltage

y = 0.868x + 2.125

1.060

11.56

3.294

0.923

y = 4.758ln(x) − 1.034

1.197

11.26

4.293

0.876

y = 0.142x2 − 0.823x + 6.757

0.811

10.64

1.380

0.977

Starch

Boundary voltage

y =  − 0.333x + 5.271

0.202

− 5.58

0.554

0.926

y =  − 1.917ln(x) + 6.634

0.212

− 6.02

0.022

0.948

y = 0.059x2 − 1.032x + 7.189

0.257

− 5.88

0.861

0.824

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