| Level 1: | Yi = β0 + β1(age) + β2(romantic involvement) + β3(age × degree of romantic involvement) + ri |
| Level 2: | β0 = γ00 + γ01(gender) + u0 |
| β1 = γ10 | |
| β2 = γ20 | |
| β3 = γ30 |
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