Identification of Dichotomous Differential Item Functioning (DIF) using Angoff's Delta Plot Method

The deltaPlotR package implements Angoff's Delta Plot method to detect dichotomous DIF. Several detection thresholds are included, either from multivariate normality assumption or by prior determination. Item purification is supported (Magis and Facon (2014) ).


News

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  • Changes and Developments in the catR Package *
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  • Changes in deltaPlotR 1.6 (2018-03-19) -

MINOR UPDATES

o The 'NAMESPACES' file was updated to get S3 methods registered.

o Some typos were fixed.


  • Changes in deltaPlotR 1.5 (2014-11-20) -

MINOR UPDATES

o The 'diagPlot' function was improved by adding the 'main' argument to allow for including a main title to the diagonal plot.

o Some typos were fixed.


  • Changes in deltaPlotR 1.4 (2014-07-22) -

MINOR UPDATES

o The 'deltaPlot' function was slightly modified to improve the capturing of the output: the 'paste' function to generate the file path was replaced by 'file.path()'.

o The references of the help files were updated.

o Some typos were fixed.


  • Changes in deltaPlotR 1.3 (2013-07-22) -

MINOR UPDATES

o A warning message has been added when the proportions of corerct responses (or Delta scores) are constant in at least one of the groups of respondents. In this case the perpendicular distances cannot be computed (since variances are equal to zero). This is highly practically implausible but this would lead to an error message. Many thanks to an anonymous reviewer who pointed out this issue.

o Some typos were fixed.


  • Changes in deltaPlotR 1.2 (2013-07-08) -

MINOR UPDATES

o A warning message has been added to avoid using the 'prop' or 'delta' value of the 'type' argument when the full item response matrix is provided to the 'data' argument.

o Several references were updated.

o Some typos were fixed.


  • Changes in deltaPlotR 1.1 (2012-08-08) -

MINOR UPDATES

o Some typos were corrected in the DESCRIPTION file.

o The CITATION file was updated to correct the package name, which was leading to an error when calling for citation within the R console.

o Several references were updated.

Reference manual

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install.packages("deltaPlotR")

1.6 by David Magis, a year ago


Browse source code at https://github.com/cran/deltaPlotR


Authors: David Magis (U Liege) , Bruno Facon (Univ Lille-Nord de France)


Documentation:   PDF Manual  


GPL (>= 2) license


Depends on MASS


Imported by ShinyItemAnalysis, difR.


See at CRAN