Treatment

Factors

Combination of factors

A

B

C

D

T₁

1

1

1

1

A₁B₁C₁D₁

T₂

1

2

2

2

A₁B₂C₂D₂

T₃

1

3

3

3

A₁B₃C₃D₃

T₄

2

1

2

3

A₂B₁C₂D₃

T₅

2

2

3

1

A₂B₂C₃D₁

T₆

2

3

1

2

A₂B₃C₁D₂

T₇

3

1

3

2

A₃B₁C₃D₂

T₈

3

2

1

3

A₃B₂C₁D₃

T₉

3

3

2

1

A₃B₃C₂D₁

T_L

2

3

3

3

A₂B₃C₃D₃