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If you are running a binary logit model then the variance is fixed at (π^2)/3 (≈3.29) rather than being an estimated parameter, and this is why you cannot add this to your model. See the following FAQ for more information about variances: Partitioning variation across levels Hey, thanks! I am runni...

Hello everyone, Please see the attached model and screenshots of a sample of the collected data as I was not allowed to attach an excel file. I would highly appreciate your time and consideration if you would share your thoughts about our study. Please read the details here: It is conceptualized in...