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Hello, all!
I am attempting to examine the covariance between two variables (callous, vict3_cfa) using a bivariate cholesky decomposition model. However, when I run the models, the unique environment estimate for the best fitting model comes out as negative.
I have read up on this topic quite a bit and I am at a lost as to why I am continuing to get a negative estimate. I have ran the model as only containing (1) twins, (2) twins and full siblings, (3) twins, full, and half siblings, and (4) twins, full, half, and non-related siblings and every time I receive a negative estimate in the unique environment. If someone could explain to me why this is happening that would be great!
Thank you all in advance for your help!