Table 4 Statistics of the Fe 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

0.318

0.330

0.370

0.379

0.388

CS-IDW

0.2813

0.2977

0.3161

0.3420

0.3511

OS-IDWW

0.325

0.348

0.386

0.392

0.399

Maximum

OS-IDW

1.853

1.800

1.880

1.840

1.793

CS-IDW

1.8548

1.7946

1.8536

1.8336

1.7922

OS-IDWW

1.853

1.800

1.880

1.840

1.793

Mean

OS-IDW

0.918

0.918

0.917

0.919

0.916

CS-IDW

0.9152

0.9151

0.9200

0.9203

0.9221

OS-IDWW

0.917

0.917

0.916

0.918

0.916

Variance

OS-IDW

0.065

0.062

0.060

0.059

0.058

CS-IDW

0.0642

0.0569

0.0566

0.0551

0.0560

OS-IDWW

0.065

0.062

0.060

0.058

0.058

Standard deviation

OS-IDW

0.255

0.250

0.245

0.243

0.240

CS-IDW

0.2534

0.2385

0.2379

0.2347

0.2366

OS-IDWW

0.255

0.248

0.244

0.242

0.241

Median

OS-IDW

0.850

0.855

0.854

0.853

0.850

CS-IDW

0.8444

0.8375

0.8485

0.8446

0.8454

OS-IDWW

0.850

0.851

0.854

0.851

0.847

Kurtosis

OS-IDW

1.0381

0.8793

0.9637

0.8807

0.8886

CS-IDW

1.0896

0.9991

1.0568

0.9912

0.9807

OS-IDWW

1.0377

0.8833

0.9694

0.8887

0.8927

Skewness

OS-IDW

1.0374

0.1720

0.6645

0.2776

0.3602

CS-IDW

1.1918

0.6397

0.9704

0.6401

0.5164

OS-IDWW

1.0304

0.2060

0.7072

0.3092

0.3358

Variation coefficient

OS-IDW

0.2778

0.2719

0.2673

0.2640

0.2618

CS-IDW

0.2768

0.2606

0.2586

0.2551

0.2566

OS-IDWW

0.2779

0.2708

0.2666

0.2634

0.2631

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