PersonMisfit: Person Misfit

In eRm: Extended Rasch Modeling

Person Misfit

Description

This function counts the number of persons who do not fit the Rasch model. More specifically, it returns the proportion and frequency of persons - or more generally cases - who exceed a Chi-square based Z-value of 1.96 (suggesting a statistically significant deviation from the predicted response pattern).

Usage

## S3 method for class 'ppar'
PersonMisfit(object)

Arguments

object

Object of class ppar.

Details

Returns the proportion and absolute number of persons who do not fit the Rasch model (Z-values > 1.96).

Value

PersonMisfit returns an object of class MisfittingPersons containing:

PersonMisfit	the proportion of misfitting persons,
count.misfit.Z	the frequency of misfitting person,
total.persons	the number of persons for whom a fit value was estimated.

Author(s)

Adrian Bruegger

Examples

rm1 <- RM(raschdat1)
pers <- person.parameter(rm1)
pmfit <- PersonMisfit(pers)
pmfit
summary(pmfit)

eRm documentation built on Sept. 28, 2023, 9:07 a.m.