inform_f_item {IRTest}

Item information function

Description

Item information function

Usage

inform_f_item(x, test, item = 1, type = "d")

Arguments

x

A vector of \theta value(s).

test

An object returned from an estimation function.

item

A natural number indicating the nth item.

type

A character value for a mixed format test which determines the item type: "d" and "p" stand for a dichotomous and polytomous item, respectively.

Value

A vector of the evaluated item information values.

Author(s)

Seewoo Li [e-mail]