prob: Probability of answer given item and theta.

In Karel-Kroeze/MCAT: What the package does (short line)

Description

Returns a vector (for G3PLM) or a matrix (GRM,SM or GPCM) of probabilities for one or more items, given a specified ability (vector).

Usage

prob(theta = 0, items, model = items$model)

Arguments

theta	Numeric, vector of length Q ability parameters.
items	Itembank, or a subset of items from an itembank. See also genItembank
model	Character, IRT response model. Can be any of "G3PL", "GRM", "SM" or "GPCM".

Details

Detailed description, response models.

Value

List with two entries, a vector or matrix p of probabilites per item/category, and a vector p0 of probabilities defined as p0 = q = 1 - sum(P_ij)

Karel-Kroeze/MCAT documentation built on May 8, 2019, 4:50 p.m.