Data pre-treatment^a

Factors

Calibration

Validation

R²

SEC

r²

SEP

RPD

Raw data

12

0.64

5.05

0.79

7.68

1.52

SG1

11

0.71

6.02

0.75

16.49

2.74

SG2

10

0.75

5.09

0.81

8.75

1.72

SNV

10

0.72

6.05

0.77

12.16

2.01

SG1-SNV

8

0.66

5.46

0.69

10.21

1.87

SG2-SNV

7

0.85

4.24

0.94

12.17

2.87

MSC

9

0.64

6.02

0.71

12.22

2.03

SG1-MSC

9

0.72

5.93

0.82

12.69

2.14

SG2-MSC

8

0.79

6.17

0.82

15.8

2.56