eRm: PersonMisfit – R documentation

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PersonMisfit

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

Extended Rasch Modeling

v1.0-2

GPL-3

Authors

Patrick Mair [cre, aut], Reinhold Hatzinger [aut], Marco J. Maier [aut], Thomas Rusch [ctb], Rudolf Debelak [ctb]

Initial release

2021-02-11