equateIRT (version 2.5.1)

id.test: 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)

Value

An object of class idtest with components

path

AB

statistic

df

p.value

Arguments

chain

an object of the class ceqc returned by function chainec.

Author

Michela Battauz

References

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

See Also

chainec

Examples

# the following code uses item parameter estimates previously obtained
# for other examples see documentation in function chainec

# 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)