| Model 1 | Model 2 |
| X1 ~ N (0, 1) | X2 ~ N (0, 1) |
| Y = ψX1 + N (0, 1) | Y= ψX2 + N (0, 1) |
| X2= ρX1 + N (0, τ2) | X1= ρX2 + N (0, τ2). |
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