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Cumpston Sarjeant review Appendix B

Exclusion of outliers from the Review of statistical methodology used in producing small business benchmarks.

Published 17 March 2025

Using Appendix B

This is taken from the Review of Statistical Methodology used in producing Small Business Benchmarks. It was undertaken by David Heath, Director of Cumpston Sarjeant Pty Ltd and Fellow of the Institute of Actuaries of Australia and delivered to us on 30th September 2013.

2011

Exclusion of outlier 2011 financial year

Industry Group

Number after outliers excluded

Number before outliers excluded

Proportion excluded

Total

334,662

397,540

16%

Air conditioning, refrigeration and heating services

3,771

4,578

18%

Alarm installation services

1,576

1,926

18%

Architectural services

7,226

8,052

10%

Automotive electrical services

1,994

2,342

15%

Bakeries and hot bread shops

2,476

3,000

17%

Barber and men's hairdressing

650

696

7%

Beauty services

2,984

3,810

22%

Blocklaying services

548

621

12%

Book retailing

644

926

30%

Bottle shops and liquor retailing

760

1,089

30%

Bricklaying services

8,725

9,244

6%

Cabinet makers

5,429

6,676

19%

Cake shops and patisseries

468

601

22%

Carpentry services

30,396

32,190

6%

Carpet laying services

3,694

4,059

9%

Catering services

1,454

1,899

23%

Cement rendering

820

908

10%

Chicken shops

395

515

23%

Child care services

3,988

4,516

12%

Chiropractic and osteopathic services

2,686

2,953

9%

Cleaning services - building and other industrial

14,180

15,179

7%

Cleaning services - carpet, rug and furniture upholstery

913

999

9%

Clothing retailing

3,594

5,381

33%

Coffee shops

4,006

5,854

32%

Computer retailing

1,643

2,235

26%

Concreting services

7,981

8,916

10%

Confectionery retailing

255

358

29%

Courier services

8,403

9,583

12%

Craft shops

405

621

35%

Delicatessen

684

870

21%

Delivery services

2,545

2,909

13%

Dental specialists

577

634

9%

Dental surgeons

5,325

6,027

12%

Discount and variety stores

339

430

21%

Domestic appliance repair and maintenance

1,687

1,917

12%

Driving schools and instructors

1,506

1,710

12%

Electrical and electronic product retailing

1,560

2,173

28%

Electrical services

16,317

18,914

14%

Entertainment media retailing

356

550

35%

Fence construction

2,456

2,962

17%

Fish and chips shops

791

945

16%

Fish and seafood retailing

518

668

22%

Floor covering retailing

1,341

1,752

23%

Florists

1,069

1,482

28%

Footwear retailing

684

962

29%

Fruit and vegetable retailing

1,354

1,756

23%

Fuel retailing

1,388

1,907

27%

Furniture removalists

692

870

20%

Furniture retailing

1,450

2,140

32%

Garden supplies retailing

1,457

2,080

30%

Gift stores

1,006

1,453

31%

Glazing services

1,789

2,068

13%

Grocery retailing and convenience stores

3,486

4,426

21%

Hairdressers

9,378

11,121

16%

Hardware and building supplies retailing

1,770

2,417

27%

Health and fitness centres

2,314

3,016

23%

Health food retailing

445

629

29%

Homewares retailing

622

908

31%

Ice cream retailing

302

470

36%

Kebab shops

198

249

20%

Landscape construction

5,554

6,413

13%

Laundry and dry-cleaning services

1,279

1,615

21%

Lawn mower retailing

340

412

17%

Lawn mowing and garden services

8,698

9,472

8%

Machinery and equipment repairs and maintenance

1,417

1,642

14%

Manchester and other textile goods retailing

1,025

1,446

29%

Meat and poultry retailing

2,172

2,643

18%

Motor vehicle parts and batteries retailing

644

856

25%

Motor vehicle retail

1,678

2,617

36%

Musical instruments retail

292

416

30%

Newsagents

2,017

2,705

25%

Painting services

16,728

17,791

6%

Panel beating and smash repairs

5,171

6,335

18%

Pest control services

1,728

1,908

9%

Pets and pet supply retailing

550

818

33%

Pharmacy

2,680

3,096

13%

Physiotherapy services

3,216

3,467

7%

Picture framing retailing

474

563

16%

Pizza shops

851

1,116

24%

Plastering and ceiling services

10,567

11,114

5%

Plumbing services

14,637

16,782

13%

Printing

2,333

3,140

26%

Printing support services

1,230

1,671

26%

Pubs, taverns and bars

2,035

3,437

41%

Restaurants

7,204

10,216

29%

Road freight transport services

22,647

29,270

23%

Roofing services, including roof tiling, guttering and metal roofing

4,410

4,876

10%

Sports and physical recreation instruction

2,755

3,271

16%

Sports, camping and fishing retailing

1,888

2,638

28%

Stationery goods retailing

473

633

25%

Takeaway food services

5,047

6,696

25%

Tiling services

5,474

5,920

8%

Timber floor sanding

804

873

8%

Tobacco retailing

386

461

16%

Towing services

575

744

23%

Toy and game retailing

491

744

34%

Tutoring and coaching

2,939

3,481

16%

Tyre retailing

1,080

1,367

21%

Veterinary services

1,728

2,014

14%

Video and other electronic media rental and hiring

627

964

35%

Watch and jewellery retailing

1,348

1,755

23%

2010

Exclusion of outlier 2010 financial year

Industry Group

Number after outliers excluded

Number before outliers excluded

Proportion excluded

Total

340,727

403,236

16%

Air conditioning, refrigeration and heating services

3,868

4,714

18%

Alarm installation services

1,613

1,918

16%

Architectural services

7,095

7,963

11%

Automotive electrical services

1,926

2,289

16%

Bakeries and hot bread shops

2,453

2,962

17%

Barber and men's hairdressing

620

666

7%

Beauty services

2,972

3,754

21%

Blocklaying services

537

587

9%

Book retailing

606

913

34%

Bottle shops and liquor retailing

782

1,161

33%

Bricklaying services

8,620

9,078

5%

Cabinet makers

5,289

6,445

18%

Cake shops and patisseries

446

585

24%

Carpentry services

31,484

33,314

5%

Carpet laying services

4,142

4,500

8%

Catering services

1,562

2,012

22%

Cement rendering

810

888

9%

Chicken shops

371

476

22%

Child care services

4,555

5,103

11%

Chiropractic and osteopathic services

2,775

3,076

10%

Cleaning services - building and other industrial

14,773

15,764

6%

Cleaning services - carpet, rug and furniture upholstery

846

943

10%

Clothing retailing

3,641

5,541

34%

Coffee shops

3,738

5,321

30%

Computer retailing

1,667

2,216

25%

Concreting services

7,975

8,880

10%

Confectionery retailing

224

335

33%

Courier services

8,626

9,926

13%

Craft shops

337

533

37%

Delicatessen

609

777

22%

Delivery services

2,236

2,568

13%

Dental specialists

558

632

12%

Dental surgeons

5,577

6,400

13%

Discount and variety stores

330

436

24%

Domestic appliance repair and maintenance

1,589

1,829

13%

Driving schools and instructors

1,496

1,671

10%

Electrical and electronic product retailing

1,610

2,252

29%

Electrical services

16,952

19,536

13%

Entertainment media retailing

340

497

32%

Fence construction

2,360

2,813

16%

Fish and chips shops

752

880

15%

Fish and seafood retailing

499

635

21%

Floor covering retailing

1,359

1,782

24%

Florists

1,079

1,432

25%

Footwear retailing

695

975

29%

Fruit and vegetable retailing

1,343

1,731

22%

Fuel retailing

1,349

1,859

27%

Furniture removalists

683

827

17%

Furniture retailing

1,439

2,133

33%

Garden supplies retailing

1,347

1,984

32%

Gift stores

908

1,341

32%

Glazing services

1,758

2,038

14%

Grocery retailing and convenience stores

3,398

4,352

22%

Hairdressers

10,007

11,808

15%

Hardware and building supplies retailing

1,727

2,378

27%

Health and fitness centres

2,687

3,468

23%

Health food retailing

408

580

30%

Homewares retailing

674

994

32%

Ice cream retailing

263

417

37%

Kebab shops

198

240

18%

Landscape construction

5,836

6,728

13%

Laundry and dry-cleaning services

1,271

1,599

21%

Lawn mower retailing

341

400

15%

Lawn mowing and garden services

9,256

10,089

8%

Machinery and equipment repairs and maintenance

1,678

1,935

13%

Manchester and other textile goods retailing

1,009

1,403

28%

Meat and poultry retailing

2,097

2,563

18%

Motor vehicle parts and batteries retailing

706

959

26%

Motor vehicle retail

1,617

2,561

37%

Musical instruments retail

292

403

28%

Newsagents

1,925

2,601

26%

Painting services

17,086

18,115

6%

Panel beating and smash repairs

5,156

6,229

17%

Pest control services

1,759

1,969

11%

Pets and pet supply retailing

578

840

31%

Pharmacy

2,604

3,145

17%

Physiotherapy services

3,417

3,703

8%

Picture framing retailing

440

531

17%

Pizza shops

766

973

21%

Plastering and ceiling services

10,661

11,140

4%

Plumbing services

15,034

17,122

12%

Printing

2,298

3,070

25%

Printing support services

1,210

1,642

26%

Pubs, taverns and bars

2,083

3,364

38%

Restaurants

7,855

11,005

29%

Road freight transport services

22,795

29,125

22%

Roofing services, including roof tiling, guttering and metal roofing

4,425

4,870

9%

Sports and physical recreation instruction

2,614

3,055

14%

Sports, camping and fishing retailing

1,895

2,717

30%

Stationery goods retailing

459

649

29%

Takeaway food services

5,518

7,203

23%

Tiling services

5,272

5,669

7%

Timber floor sanding

806

878

8%

Tobacco retailing

386

471

18%

Towing services

598

748

20%

Toy and game retailing

496

788

37%

Tutoring and coaching

3,243

3,824

15%

Tyre retailing

1,119

1,418

21%

Veterinary services

1,720

2,060

17%

Video and other electronic media rental and hiring

547

846

35%

Watch and jewellery retailing

1,276

1,698

25%

QC103954