Factorial design
An efficient design for experiments with two or more factors uses each possible combination of factor levels (called treatments) in the same number of experimental units. The repeat measurements for each treatment are called replicates and the design is called a factorial design.
The design on the previous page was an example of a factorial design for two factors but similar designs are also used for three or more factors.
Factor C | |||||
---|---|---|---|---|---|
C1 | C2 | ||||
Factor B | Factor B | ||||
Factor A | B1 | B2 | B1 | B2 | |
A1 | 527 561 |
456 377 |
475 466 |
296 325 |
|
A2 | 621 664 |
426 476 |
561 540 |
301 235 |
|
A3 | 724 743 |
460 426 |
626 682 |
322 304 |