eRm (version 1.0-1)

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 ppar
PersonMisfit(object)

Arguments

object

Object of class ppar.

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.

Details

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

Examples

# NOT RUN {
rm1 <- RM(raschdat1)
pers <- person.parameter(rm1)
pmfit <- PersonMisfit(pers)
pmfit
summary(pmfit)
# }