test_prop: Properties of the test

Description Usage Arguments Value Author(s) References Examples

View source: R/Person-Fit.R

Description

Information summarizing measurement quality of the test and test targeting.

Usage

1
test_prop(object)

Arguments

object

object of class eRm, a fitted Rasch model oder 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

Author(s)

Marianne Mueller

References

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

Examples

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rm.mod <- RM(amts[,4:13])
test_prop(rm.mod)

muellermarianne/iarm documentation built on June 7, 2018, 1:13 p.m.