Data pre-treatment^a

Factors

Calibration

Validation

R²

SEC

r²

SEP

RPD

Raw data

14

0.47

6.21

0.61

7.51

1.21

SG1

12

0.61

7.12

0.72

15.88

2.23

SG2

13

0.33

6.12

0.51

7.96

1.3

SNV

11

0.58

4.23

0.72

6.01

1.42

SG1-SNV

11

0.42

6.05

0.56

16.76

2.77

SG2-SNV

14

0.78

5.42

0.91

14.04

2.59

MSC

10

0.56

6.02

0.6

8.49

1.41

SG1-MSC

13

0.49

6.22

0.62

7.65

1.23

SG2-MSC

13

0.65

5.98

0.79

13.04

2.18