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Alternative models of allelic interaction
| Model | Description | Probability of 0, 1, 2 alleles ibd in affected sib pair
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| ζ0 | ζ1 | ζ2 | |||||
| β | No allelic interaction on logistic scale |
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| γ | No allelic interaction on penetrance scale |
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| Δ | Allelic interaction on logistic scale (Δ ≠ β) |
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