The function takes the posterior predicitve probabilities (from
post_prob_irtree) and calculates for every
iteration-person-item combination the expected response. This is needed for
Yen's Q3 (see
Numeric array of dimension R x N x J x 5 (for N persons, J items with 5 categories, and R iterations).
Array of expected responses of dimension R x N x J (for N persons, J items, and R iterations).
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