Table 4.6 summarizes the operators that are available for selecting and constructing effects. These operators are discussed in the following sections.
Table 4.6: Available Effect Operators
|
Operator |
Example |
Description |
|---|---|---|
|
A*B |
Crosses the levels of the effects |
|
|
A(B) |
Nests A levels within B levels |
|
|
A | B | C |
Specifies all interactions |
|
|
A | B | C@2 |
Reduces interactions in bar effects |
|
|
A1-A10 |
Specifies sequentially numbered variables |
|
|
A: |
Specifies variables with common prefix |
|
|
A- -C |
Specifies sequential variables in data set order |