summary.ceqc: Summarizing Estimated Chain Equating Coefficients

In equateIRT: IRT Equating Methods

Summarizing Estimated Chain Equating Coefficients

Description

summary method for class ceqc.

Usage

## S3 method for class 'ceqc'
summary(object, ...)

## S3 method for class 'summary.ceqc'
print(x, ...)

Arguments

object	an object of the class ceqc returned by function chainec.
x	an object of class summary.ceqc, a result of a call to summary.ceqc.
...	further arguments passed to or from other methods.

Value

The function summary.ceqc returns a list with components

forms	names of equated forms.
method	the equating method used.
coefficients	a 2 \times 2 matrix with columns for the estimated coefficients A and B and standard errors.

Author(s)

Michela Battauz

See Also

chainec, modIRT

Examples

# the following code uses item parameter estimates previously obtained
# for examples that start from item response data see function modIRT

# two-parameter logistic model
# direct equating coefficients using the "Haebara" method
data(est2pl)
test<-paste("test", 1:5, sep = "")
mod2pl <- modIRT(coef = est2pl$coef, var = est2pl$var, names = test, display = FALSE)
direclist2pl <- alldirec(mods = mod2pl, method = "Haebara")
# compute all chain equating coefficients of length 3
chainec3 <- chainec(r = 3, direclist = direclist2pl)
summary(chainec3$test1.test5.test4)	

equateIRT documentation built on Oct. 4, 2024, 1:10 a.m.