Path Analysis

Hello,

In the video reviewing path analysis, why do we include VE when calculating the covariance in the ADE model? I had thought the covariance for MZ twins would be VA + VD and the covariance for DZ twins would be .5VA +.25VD. But the slide states that the covariance for DZ twins would be “.5VA+.25VD+VE” (around 20:46 in the video).

Thank you!

3 Likes

Thank you @oconnors This was a typo on my part. You are correct. The covariance for DZ twins is indeed 0.5VA + 0.25VD

2 Likes

Thank you for clarifying! I just wanted to make sure I wasn’t missing something!

2 Likes