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