Calculate posterior for one item given score, difficulty and prior

Calculate posterior for one item given score, difficulty and prior

posterior(score, tau, prior, qp)

Arguments

score	Integer, either 0 (fail) and 1 (pass)
tau	Numeric, difficulty parameter
prior	Vector of prior values on quadrature points qp
qp	vector of equally spaced quadrature points

Value

A vector of length length(prior)

Details

This function assumes that the difficulties have been estimated by a binary Rasch model (e.g. by sirt::rasch.pairwise.itemcluster()).

Note

: Internal function

See also

dscore(), sirt::rasch.pairwise.itemcluster()

Author

Stef van Buuren, Arjan Huizing, 2020