Table 2 Statistical characteristics of metal content.

From: Coal seam in-situ inorganic analysis based on least angle regression and competitive adaptive reweighted sampling algorithm by XRF–visNIR fusion

Set type

Core

Metal

Max. (%)

Min. (%)

Mean (%)

SD (%)

CV (%)

Skewness

Kurtosis

LOOCV set(train set)

S1

Si

46.877

2.602

25.763

9.755

0.379

− 0.077

− 0.692

Al

21.918

3.249

12.399

4.164

0.336

0.048

− 0.781

K

3.441

0.288

1.784

0.718

0.403

− 0.004

− 0.812

Ca

10.427

0.184

5.370

3.012

0.561

− 0.075

− 1.313

Fe

11.534

0.355

5.835

2.953

0.506

0.127

− 1.121

Ti

1.457

0.061

0.749

0.341

0.454

0.069

− 0.936

Validation set

S2

Si

43.270

3.474

21.847

9.883

0.452

0.238

− 0.793

Al

22.615

3.132

10.664

4.597

0.431

0.393

− 0.459

K

4.501

0.620

1.960

0.768

0.392

0.638

0.474

Ca

12.099

0.393

4.976

2.897

0.582

0.375

− 0.608

Fe

13.504

0.624

5.119

2.842

0.555

0.517

− 0.294

Ti

2.565

0.150

1.099

0.474

0.431

0.691

0.333

Test set

S3

Si

36.738

9.009

21.655

6.126

0.283

0.361

− 0.404

Al

17.809

3.133

10.706

2.715

0.254

0.350

0.535

K

3.366

0.828

1.960

0.451

0.230

0.239

0.853

Ca

10.674

1.792

5.094

1.678

0.329

0.220

0.410

Fe

8.652

1.053

5.138

1.587

0.309

− 0.192

− 0.490

Ti

2.022

0.541

1.078

0.297

0.276

0.229

0.121

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