Dear forum
I am trying to conduct a meta-analysis on the heritability of two traits that are different, yet related (I found six studies in which the twins were measured in both traits).
From what I know, in order to directly compare between the two traits heritability, I need to enter them in the same model, and for that, I need either the raw data or the full correlation matrix (and I have neither).
I would like to ask: Does anyone know a way to perform a direct statistical comparison between the heritability estimates of these traits, given that I only have information about the cross-twin-within-traits correlations, but not about the cross-twin-cross-trait correlations (e.g., the correlation between one twin 1 in trait 1 and the second twin in trait 2, separately for MZ and DZ twins)? Is a descriptive comparison between the heritability estimates of the traits the only option?
Thank you very much for your help,
Lior