Hi! great video, thank you very much. I have a question: In the example, the item difficulty is measured from the proportion of right answers of that item, as classical theory does. How does it make that parameter sample-independent, as IRT is supposed to be? Thank you in advance!
Great Video! I’m studying for my bachelor’s in psychology right now and I didn’t really get what the fuss was all about with IRT, but you made me go ‚oh wow‘ three times in just 10 minutes. Thank u :)
Thank you for the comprehensive explanation! Scale validation is a dense subect, I am glad there are resources like this lecture to help us make sense of things.
