calc_posterior_single {TestDesign}

Calculate a posterior value of theta for a single item

Description

Calculate a posterior value of theta for a single item.

Usage

calc_posterior_single(x, item_parm, resp, ncat, model, prior, prior_parm)

Arguments

x

A length-one numeric vector for a theta value.

item_parm

A numeric vector of item parameters (for one item).

resp

A length-one numeric vector of item responses.

ncat

A length-one numeric vector of the number of response categories by item.

model

A length-one numeric vector of the IRT model by item (1: 1PL, 2: 2PL, 3: 3PL, 4: PC, 5: GPC, 6: GR).

prior

The type of prior distribution (1: normal, 2: uniform).

prior_parm

A numeric vector of hyperparameters for the prior distribution, c(mu, sigma) or c(ll, ul).