Genepi Twin Power Generator

This site provides automated power analysis for the detection of additive genetic (A) and common environmental (C) variance components of a quantitative trait in the classical twin design. Please send suggestions, comments to Peter Visscher. If you use this site, please reference the following Twin Research and Human Genetics papers :

Visscher P.M. (2004). Power of the classical twin design revisited. Twin Research 7, 505-512 (PDF file here).

Visscher P.M., Gordon S., Neale M.C. (2008). Power of the classical twin design revisited: II Detection of Common Environmental Variance. Twin Research and Human Genetics 11, 48-54. (PDF file here)

Setting Model Parameters

Please enter model parameters here :

Number of MZ pairs
Number of DZ pairs
Additive genetic variance (A)
Common environment (C)
Unique environment (E)
Type I error rate
Power

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