summary.eqc: Summarizing Estimated Equating Coefficients

In equateIRT: IRT Equating Methods

Summarizing Estimated Equating Coefficients

Description

summary method for class eqc.

Usage

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

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

Arguments

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

Value

The function summary.eqc 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

direc, modIRT

Examples

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

# three-parameter logistic model
# direct equating coefficients between forms 1 and 2 using the Stocking-Lord method
data(est3pl)
test <- paste("test", 1:5, sep = "")
mod3pl <- modIRT(coef = est3pl$coef, var = est3pl$var, names = test, display = FALSE)
l12 <- direc(mod1 = mod3pl[1], mod2 = mod3pl[2], method = "Stocking-Lord")
summary(l12)

equateIRT documentation built on June 8, 2025, 1:12 p.m.