% Generated by roxygen2: do not edit by hand
% Please edit documentation in R/person.R
\name{item_moments}
\alias{item_moments}
\title{Category-score moments for a polytomous item}
\usage{
item_moments(theta, tau_i, disc = 1)
}
\arguments{
\item{theta}{Person location, in logits.}

\item{tau_i}{Numeric vector of the item's threshold parameters.}

\item{disc}{Discrimination (frame unit) multiplier on the exponent; 1 for
the ordinary Rasch model.}
}
\value{
A list with category probabilities \code{P}, expected score \code{E},
  variance \code{V}, and third and fourth central moments \code{mu3},
  \code{mu4}.
}
\description{
Category-score moments for a polytomous item
}
\examples{
item_moments(0.5, c(-1, 0, 1))
}
