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4PL item-response probability

Source: R/083-irt-foundations-information-0-9.R
eyeprocess_irt_4pl_probability.Rd

4PL item-response probability

Usage

eyeprocess_irt_4pl_probability(theta, a = 1, b = 0, c = 0, d = 1, D = 1)

Arguments

theta

Latent-trait value or vector of latent-trait values.

a

Item discrimination parameter or vector.

b

Item difficulty or location parameter or vector.

c

Lower-asymptote parameter or vector.

d

Upper-asymptote parameter or vector.

D

Logistic scaling constant.