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\name{PersonMisfit}
\alias{PersonMisfit}
\alias{PersonMisfit.ppar}
%- Also NEED an '\alias' for EACH other topic documented here.
\title{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{
\method{PersonMisfit}{ppar}(object)
}
%- maybe also 'usage' for other objects documented here.
\arguments{
\item{object}{Object of class \code{ppar}.}
}
\details{
Returns the proportion and absolute number of persons who do not fit the Rasch model (Z-values > 1.96).
}
\value{
\code{PersonMisfit} returns an object of class \code{MisfittingPersons} containing:
\item{PersonMisfit}{the proportion of misfitting persons,}
\item{count.misfit.Z}{the frequency of misfitting person,}
\item{total.persons}{the number of persons for whom a fit value was estimated.}
}
\author{Adrian Bruegger}
%\note{}
\examples{
rm1 <- RM(raschdat1)
pers <- person.parameter(rm1)
pmfit <- PersonMisfit(pers)
pmfit
summary(pmfit)
}
\keyword{person misfit}
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