1. What is expj in Equation 10?
expj represents the exposure rate for item j.
2. Why the output of estimate of theta was not reported?
Because the latent ability is a vector of latent binary variables (or latent profile) in CDMs instead of latent trait in IRT. Thus, when all examinees were finished tests then output examinees' latent profile and calculate the classificaiton accuracy of every attributes and entrie profile.