Table 5 The clustering results of six alignment-free models against sliding window size on the dataset HOG20, HOG50, HOG80 and HOG100

0.6401

0.6505

0.6388

0.5986

0.5253

0.7808

0.7646

0.7639

0.6900

0.5674

0.5649

0.5765

0.5817

0.5798

0.5798

N/A

0.6064

0.5934

0.6206

0.6595

0.6174

0.6206

0.6329

0.6297

0.6128

0.8119

0.7970

0.8113

0.7879

0.7737

0.5810

0.5725

0.5364

0.5486

0.5332

0.7493

0.7526

0.6807

0.6066

0.5455

0.4521

0.5053

0.4966

0.5334

0.5363

N/A

0.4797

0.4795

0.5327

0.5613

0.5744

0.5839

0.5910

0.5466

0.5339

0.7677

0.7682

0.7791

0.7720

0.7178

0.5531

0.5534

0.5621

0.5149

0.4713

0.6252

0.6117

0.6072

0.5654

0.4614

0.3953

0.3892

0.4295

0.4448

0.4370

N/A

0.4983

0.5377

0.5672

0.5786

0.5329

0.5206

0.5425

0.5260

0.5347

0.6453

0.6483

0.6369

0.6351

0.6396

0.4539

0.4273

0.4643

0.4490

0.4458

0.5170

0.5334

0.4742

0.4647

0.3999

0.2991

0.2719

0.2901

0.3254

0.3247

N/A

0.3809

0.4454

0.4553

0.5083

0.4229

0.4164

0.4132

0.4304

0.4226

0.5351

0.5411

0.5544

0.5441

0.5576

0.5925

0.5841

0.5447

0.5381

0.4982

0.6501

0.6381

0.6542

0.6452

0.5451

0.4727

0.4721

0.4830

0.4957

0.4932

N/A

0.5655

0.5615

0.5979

0.6163

0.5714

0.5840

0.5979

0.6053

0.5748

0.6728

0.6691

0.6508

0.6721

0.6768

0.4102

0.3838

0.4171

0.4570

0.4411

0.4759

0.4187

0.4892

0.4379

0.4106

0.2749

0.2792

0.2776

0.3287

0.3249

N/A

0.3594

0.3555

0.3941

0.4363

0.3897

0.4063

0.3819

0.4069

0.4089

0.5024

0.4624

0.4585

0.4614

0.4751

0.5001

0.5404

0.5622

0.5320

0.4725

0.6033

0.6233

0.6330

0.5651

0.4358

0.4203

0.4437

0.4381

0.4197

0.4473

N/A

0.5101

0.4952

0.5646

0.5710

0.4923

0.5132

0.5450

0.5416

0.5547

0.6421

0.6359

0.6159

0.6295

0.6331

0.3391

0.3785

0.4051

0.4436

0.4196

0.4498

0.4582

0.4870

0.4163

0.3280

0.2900

0.2985

0.2911

0.2801

0.3172

N/A

0.3438

0.3447

0.3741

0.4310

0.3264

0.3329

0.3793

0.3827

0.4310

0.4780

0.4491

0.4442

0.4509

0.4617