WrightMap: IRT Item-Person Map with 'ConQuest' Integration

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A powerful yet simple graphical tool available in the field of psychometrics is the Wright Map (also known as item maps or item-person maps), which presents the location of both respondents and items on the same scale. Wright Maps are commonly used to present the results of dichotomous or polytomous item response models. The 'WrightMap' package provides functions to create these plots from item parameters and person estimates stored as R objects. Although the package can be used in conjunction with any software used to estimate the IRT model (e.g. 'TAM', 'mirt', 'eRm' or 'IRToys' in 'R', or 'Stata', 'Mplus', etc.), 'WrightMap' features special integration with 'ConQuest' to facilitate reading and plotting its output directly.The 'wrightMap' function creates Wright Maps based on person estimates and item parameters produced by an item response analysis. The 'CQmodel' function reads output files created using 'ConQuest' software and creates a set of data frames for easy data manipulation, bundled in a 'CQmodel' object. The 'wrightMap' function can take a 'CQmodel' object as input or it can be used to create Wright Maps directly from data frames of person and item parameters.

Author
David Torres Irribarra & Rebecca Freund
Date of publication
2016-03-23 23:41:08
Maintainer
David Torres Irribarra <dti@berkeley.edu>
License
BSD_2_clause + file LICENSE
Version
1.2.1

View on CRAN

Man pages

CQmodel
ConQuest Output Processing
fitgraph
Item Fit Graphs
item.person.data
Processing CQmodel objects for plotting
item.side
Wright Map item sides
make.deltas
Calculate Master's Delta parameters.
make.thresholds
Calculate Thurstonian thresholds.
person.side
Wright Map person sides
plotCI
Plotting confidence intervals and DIF
ppPlot
Person probability plots
wrightMap
wrightMap: item-person maps
WrightMap-package
Wright Map: IRT Item-Person Map

Files in this package

WrightMap
WrightMap/inst
WrightMap/inst/CITATION
WrightMap/inst/extdata
WrightMap/inst/extdata/ex7a.eap
WrightMap/inst/extdata/ex6a.shw
WrightMap/inst/extdata/ex2.shw
WrightMap/inst/extdata/ex2b.eap
WrightMap/inst/extdata/ex4a.shw
WrightMap/inst/extdata/ex7a.shw
WrightMap/inst/extdata/ex2a.shw
WrightMap/inst/extdata/ex4a.mle
WrightMap/inst/extdata/ex2.eap
WrightMap/inst/extdata/ex2a.eap
WrightMap/inst/extdata/ex2b-2.shw
WrightMap/NAMESPACE
WrightMap/NEWS
WrightMap/R
WrightMap/R/personHist.R
WrightMap/R/itemData.character.R
WrightMap/R/wrightMap.R
WrightMap/R/itemData.R
WrightMap/R/itemData.CQmodel.R
WrightMap/R/fitgraph.R
WrightMap/R/make.deltas.CQmodel.R
WrightMap/R/CQmodel.R
WrightMap/R/difplot.R
WrightMap/R/print.SOE.R
WrightMap/R/fitgraph.default.R
WrightMap/R/difplot.default.R
WrightMap/R/personData.R
WrightMap/R/make.deltas.default.R
WrightMap/R/fitgraph.CQmodel.R
WrightMap/R/itemHist.R
WrightMap/R/itemData.default.R
WrightMap/R/print.CQmodel.R
WrightMap/R/make.thresholds.CQmodel.R
WrightMap/R/difplot.character.R
WrightMap/R/make.deltas.R
WrightMap/R/cutLines.R
WrightMap/R/make.thresholds.default.R
WrightMap/R/personDens.R
WrightMap/R/fitgraph.character.R
WrightMap/R/difplot.CQmodel.R
WrightMap/R/itemModern.R
WrightMap/R/make.thresholds.matrix.R
WrightMap/R/personData.character.R
WrightMap/R/personData.default.R
WrightMap/R/itemClassic.R
WrightMap/R/make.thresholds.character.R
WrightMap/R/plot.CQmodel.R
WrightMap/R/ppPlot.R
WrightMap/R/personData.CQmodel.R
WrightMap/R/plotCI.R
WrightMap/R/fitgraph.numeric.R
WrightMap/R/make.deltas.character.R
WrightMap/R/make.thresholds.R
WrightMap/README.md
WrightMap/MD5
WrightMap/DESCRIPTION
WrightMap/man
WrightMap/man/CQmodel.Rd
WrightMap/man/person.side.Rd
WrightMap/man/make.deltas.Rd
WrightMap/man/plotCI.Rd
WrightMap/man/ppPlot.Rd
WrightMap/man/fitgraph.Rd
WrightMap/man/wrightMap.Rd
WrightMap/man/item.side.Rd
WrightMap/man/make.thresholds.Rd
WrightMap/man/item.person.data.Rd
WrightMap/man/WrightMap-package.Rd
WrightMap/LICENSE