id.test: Identity Test

In equateIRT: IRT Equating Methods

Identity Test

Description

Performs a statistical test to verify if the chain equating coeffients from one form to itself are A=1 and B=0.

Usage

id.test(chain)

Arguments

chain

an object of the class ceqc returned by function chainec.

Value

An object of class idtest with components

path
AB
statistic
df
p.value

Author(s)

Michela Battauz

References

Battauz, M. (2022). Testing for differences in chain equating. Statistica Neerlandica, 1-12.

Examples

# three-parameter logistic model
# direct equating coefficients using the "Haebara" method
data(est3pl)
test <- paste("test", 1:5, sep = "")
mod3pl <- modIRT(coef = est3pl$coef, var = est3pl$var, names = test, display = FALSE)
direclist3pl <- alldirec(mods = mod3pl, method = "Haebara")
# compute chain equating coefficients for path 1,2,3,4,5,1
pth3 <- paste("test", c(1:5,1), sep = "")
chainec_circle <- chainec(direclist = direclist3pl, pths = pth3)
summary(chainec_circle)
# test
id.test(chainec_circle)

equateIRT documentation built on Aug. 8, 2022, 5:08 p.m.