iarm (version 0.1.2)

test_prop: Properties of the Test

Description

Information summarizing measurement quality of the test and test targeting.

Usage

test_prop(object)

Arguments

object

An object of class eRm, a fitted Rasch model or partial credit model using the functions RM or PCM in package eRm.

Value

a list containing:

Separation reliability

the person separation reliability as calculated in package eRm

Test difficulty

person value with an expected score equal to half of the maximum score.

Test target

person value where test information is maximized.

Test information

maximal value of the test information

References

Christensen, K. B. , Kreiner, S. & Mesbah, M. (Eds.) Rasch Models in Health. Iste and Wiley (2013), pp. 63 - 70.

Examples

# NOT RUN {
rm.mod <- RM(amts[,4:13])
test_prop(rm.mod)
# }