Could you give a worked example on the steps of Expectation Maximization in Item Response Theory if we use the Two Parameter Rasch Model.
The student abilities are unknown and the question parameters are unknown as well. How can we use Expectation Maximization (EM) to find these unknown parameters if we know what questions each student has got correct.
(note: I have found a two sources online but I do not understand them. A worked example would be fantastic: http://www.openirt.com/b-a-h/papers/note9801.pdf and http://www.lsac.org/docs/default-source/research-(lsac-resources)/rr-11-01.pdf?sfvrsn=2)