tracedifitem: Difference in tracelines for just a pair of items

In falkcarl/mpirt: Semi- and non-parametric item response theory

Difference in tracelines for just a pair of items

Description

Difference in tracelines for just a pair of items

Usage

tracedifitem(
  item1,
  item2,
  par1,
  par2,
  method = c("RIMSD", "ISD", "IAD"),
  scale = TRUE,
  theta = seq(-5, 5, 0.1),
  w = dnorm(theta)/sum(dnorm(theta))
)

Arguments

item1	Item specification. e.g., from rpf.
item2	Item specification. e.g., from rpf.
par1	Item parameters for item 1.
par2	Item parameters for item 2.
method	Which type of discrepancy to compute? RIMSD, ISD, or IAD.
scale	logical value to determine whether to scale each expected score value to 0-1.
theta	Grid over which to compute the traceline.
w	Vector of weights; usually these should sum to 1.

Details

This is a convenience function which allows computation of RIMSD, ISD, or IAD from two item specifications and their parameters.

falkcarl/mpirt documentation built on July 11, 2024, 12:09 a.m.