equateIRT (version 2.5.1)

summary.ceqc: Summarizing Estimated Chain Equating Coefficients

Description

summary method for class ceqc.

Usage

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

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.

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.

Author

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)