genTrueItems: Generate true item parameters for NEAT design

In simExam: Generate Simulated Data for IRT-Enabled Exams

Description

Creates true item parameters for a 2-parameters IRT model for posterior generation of item responses, IRT implementation and equating. Compatible with the common-item, non-equivalent group design (see Kolen et. al. 2004).

Usage

genTrueItems(C, J, U, num.forms, min.a = 0.5, max.a = 2, mu.b = 0,
  sd.b = 1, anchor.type = "internal", output = "list",
  linkage.plan = NULL, ...)

Arguments

C	number of common items between two forms
J	number of items per form
U	number of unique items per form (only valid for external anchor)
num.forms	number of forms
min.a	Lower bound for the (uniform) distribution of item discrimination parameter
max.a	Upper bound for the (uniform) distribution of item discrimination parameter
mu.b	Mean of (normally-distributed) item difficulty parameter
sd.b	Standard deviation of (normally-distributed) item difficulty parameter
anchor.type	type of anchor item set ("internal" or "external")
output	type of output; "list" gives a list of used items per form, "matrix" gives a joint matrix (data.frame).
linkage.plan	matrix containing linkage plan
...	extra parameters to be passed to genItemBankInt() or genItemBankExt()

Value

List of true item parameters per form

Author(s)

Waldir Leoncio

simExam documentation built on Aug. 2, 2019, 5:05 p.m.