Table 3 Statistics of the Al grade estimation results.

From: A new method for estimating ore grade based on sample length weighting

Name of statistic

Method

Number of samples

3

4

5

6

7

Minimum

OS-IDW

10.881

11.183

11.819

12.012

12.483

CS-IDW

10.999

11.208

11.808

12.019

12.486

OS-IDWW

10.887

11.186

11.751

12.015

12.253

Maximum

OS-IDW

18.513

18.412

18.338

18.296

18.360

CS-IDW

19.020

19.020

19.020

18.674

18.465

OS-IDWW

18.513

18.643

18.549

18.629

18.844

Mean

OS-IDW

15.481

15.474

15.490

15.496

15.492

CS-IDW

15.570

15.575

15.599

15.594

15.619

OS-IDWW

15.489

15.478

15.492

15.499

15.505

Variance

OS-IDW

1.314

1.181

1.097

0.995

0.866

CS-IDW

1.344

1.143

1.062

0.950

0.896

OS-IDWW

1.337

1.194

1.110

0.998

0.919

Standard deviation

OS-IDW

1.146

1.087

1.047

0.998

0.930

CS-IDW

1.159

1.069

1.030

0.975

0.947

OS-IDWW

1.156

1.093

1.054

0.999

0.959

Median

OS-IDW

15.300

15.352

15.336

15.285

15.321

CS-IDW

15.397

15.409

15.426

15.422

15.446

OS-IDWW

15.322

15.349

15.337

15.285

15.321

Kurtosis

OS-IDW

0.0646

0.2384

0.3238

0.6286

0.7290

CS-IDW

−0.071

−0.065

0.042

0.302

0.538

OS-IDWW

0.0934

0.2425

0.3394

0.6112

0.8520

Skewness

OS-IDW

3.0789

3.2096

2.6931

2.4589

1.9065

CS-IDW

2.665

3.231

2.885

2.441

1.900

OS-IDWW

3.0280

3.1291

2.6486

2.4479

2.2796

Variation coefficient

OS-IDW

0.0741

0.0702

0.0676

0.0644

0.0601

CS-IDW

0.074

0.069

0.066

0.063

0.061

OS-IDWW

0.0746

0.0706

0.0680

0.0645

0.0618

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