get.itn: Read ConQuest 'itanal' Output Files

In weirichs/eatModel: Educational Assessment Tools for IRT Modeling using Conquest or TAM

Read ConQuest ‘itanal’ Output Files

Description

Reads Conquest files comprising item analyses generated by the itanal statement.

Usage

get.itn(file)

Arguments

file	Character string with the name of the Conquest item analysis file.

Value

A data frame with 18 columns:

item.nr	Number of the item in the analysis
item.name	Name of the item
Label	Response category label
Score	Score of this response category
n.valid	Total number of students who responded to this item
Abs.Freq	Number of students who gave this response
Rel.Freq	Number of students who gave this response as a percentage of the total number of respondents to the item
item.p	Percentage of students who answered this item correctly
diskrim	Item discrimination
pt.bis	Point-biserial correlation for this response
t.value	T-Value of the significance test whether the point-biserial correlation is different from 0
p.value	p-Value of the significance test whether the point-biserial correlation is different from 0
PV1.Avg.1	Mean ability (in the first latent dimension) of students who gave this response (based on plausible values)
PV1.SD.1	Standard deviation of ability of students who gave this response (based on plausible values)
threshold	Item threshold
delta	Item delta

If the model is multidimensional, the mean and standard deviation of the ability of students who gave the respective response will be shown for each dimension.

References

See pp. 193 of Wu, M.L., Adams, R.J., Wilson, M.R., & Haldane, S.A. (2007). ACER ConQuest Version 2.0. Generalised Item Response Modeling Software. Camberwell, Victoria: ACER Press.

Examples

file <- system.file("extdata", "twodim.itn", package = "eatModel")
itn  <- get.itn(file)

weirichs/eatModel documentation built on Jan. 26, 2025, 4:01 p.m.