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Types of interaction between two factors
| Interactive effects | Condition |
|---|---|
| Weaken |  |
| Weaken, univariate |  |
| Weaken, nonlinear |  |
| Enhance, bivariate |  |
| Enhance, nonlinear |  |
| Independent |  |
The symbol of “
” means the interaction of two factors, and 
represents the q-value for the interaction between two factors X1 and X2.
