itm.mlteqc {equateMultiple} | R Documentation |
Extract Item Parameters
Description
itm
is a generic function which extracts a data frame containing the
item parameters of multiple forms being equated in the original scale and
the item parameters converted to the scale of the base form.
Usage
## S3 method for class 'mlteqc'
itm(x, ...)
Arguments
x |
object of the class |
... |
further arguments passed to or from other methods. |
Value
A data frame containing item names (Item
),
item parameters of all the forms (e.g. T1
, ..., T3
),
and item parameters of all the forms converted
in the scale of the base form (e.g. T3.as.T1
).
Author(s)
Michela Battauz
See Also
Examples
data(est2pl)
# prepare the data
mods <- modIRT(coef = est2pl$coef, var = est2pl$var, display = FALSE)
# Estimation of the equating coefficients with the multiple item response function method
eqIRF <- multiec(mods = mods, base = 1, method = "irf")
# extract item parameters
itm(eqIRF)
[Package equateMultiple version 0.1.2 Index]