| Variety + Nitrogen | main effects of Variety and Nitrogen |
| Variety . Nitrogen | interaction term for Nitrogen and Variety |
| Variety * Nitrogen | same as Variety + Nitrogen + Variety.Nitrogen |
| + | addition | A+B+C | main effects of A, B, and C |
| . | interaction | A.B | interaction of A and B |
| * | cross-product | A*B | is equivalent to A+B+A.B |
| / | nesting | A/B | is equivalent to A+A.B |
The following operators can also be used in formulae. A full definition of their meaning is found in The Guide to GenStat® Release 7.1 - Part 1: Syntax and Data Management.
| - | subtraction |
| -/ | nested deletion |
| -* | crossed deletion |
| // | linkage of pseudo terms |