Sib-pair Command: tetrachoric

ClassGlobal Utility
Arguments <prevalence> <recurrence risk ratio>

Calculate tetrachoric correlation equivalent to given recurrence risk ratio and trait prevalence. This is useful for estimating heritability under the multifactorial threshold model.


# For a trait with lifetime risk of 5%, a sibling recurrence risk ratio
# of 2 corresponds to a MFT heritability of 37%
>> tetrachoric 0.05 2

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