I am looking to use Item Response Theory with Jamovi. I want to test unidimensionality of my Likert scale, so I think of comparing the fit indices of the unidimensional model and the multidimensional model. I also want to assess both item discrimination (a) and item difficulty (b). Are there any packages available in Jamovi for solving these questions ?
I have done some research and I have found the snowirt package, but it covers only the Rasch models, so only one parameter of Item Response Theory. Do you have any recommendations on this subject ?
Thank you so much !
