mirt (version 1.16)

MDIFF: Compute multidimensional difficulty index

Description

Returns a matrix containing the MDIFF values (Reckase, 2009). Only suppored for items of class 'dich' and 'graded'.

Usage

MDIFF(x, which.items = NULL)

Arguments

x

an object of class 'SingleGroupClass'

which.items

a vector indicating which items to select. If NULL is used (the default) then MDISC will be computed for all items

References

Reckase, M. D. (2009). Multidimensional Item Response Theory. Springer.

See Also

extract.group, MDISC

Examples

# NOT RUN {
mod <- mirt(Science, 2)
MDIFF(mod)

# }