4PL-class {irt}

Three-Parameter Logistic IRT model

Description

Three-Parameter Logistic IRT model

Slots

a

Item discrimination parameter

b

Item difficulty parameter

c

Guessing parameter

d

Upper-asymptote Parameter

D

Scaling constant

se_a

Standard error of item discrimination parameter

se_b

Standard error of item difficulty parameter

se_c

Standard error of guessing parameter

se_d

Standard error of upper-asymptote parameter

Author(s)

Emre Gonulates