difNLR-package: DIF and DDF Detection by Non-Linear Regression Models.

Description Details Note Author(s) References See Also


The difNLR package containts method for detection of differential item functioning (DIF) based on non-linear regression. Both uniform and non-uniform DIF effects can be detected when considering one focal group. The method also allows to test the difference in guessing or inattention parameters between reference and focal group. DIF detection method is based either on likelihood-ratio test, or on F-test of submodel. Package also offers method for detection of differential distractor functioning (DDF) based on multinomial log-linear regression model.


Package: difNLR
Type: Package
Version: 1.2.1
Date: 2018-03-01
Depends: R (>= 3.4.3), CTT, ggplot2 (>= 2.2.1), methods, msm, nnet, reshape2, stats
License: GPL-3
BugReports: https://github.com/drabinova/difNLR/issues


This package was supported by grant funded by Czech Science foundation under number GJ15-15856Y.


Adela Drabinova
Institute of Computer Science, The Czech Academy of Sciences
Faculty of Mathematics and Physics, Charles University
[email protected]

Patricia Martinkova
Institute of Computer Science, The Czech Academy of Sciences
[email protected]

Karel Zvara
Faculty of Mathematics and Physics, Charles University


Drabinova, A. & Martinkova P. (2017). Detection of Differential Item Functioning with NonLinear Regression: Non-IRT Approach Accounting for Guessing. Journal of Educational Measurement, 54(4), 498-517.

Kingston, N., Leary, L., & Wightman, L. (1985). An Exploratory Study of the Applicability of Item Response Theory Methods to the Graduate Management Admission Test. ETS Research Report Series, 1985(2) : 1-64.

Martinkova, P., Drabinova, A., Liaw, Y. L., Sanders, E. A., McFarland, J. L., & Price, R. M. (2017). Checking equity: Why Differential Item Functioning Analysis Should Be a Routine Part of Developing Conceptual Assessments. CBE-Life Sciences Education, 16(2), http://www.lifescied.org/content/16/2/rm2.

Swaminathan, H. & Rogers, H. J. (1990). Detecting Differential Item Functioning Using Logistic Regression Procedures. Journal of Educational Measurement, 27, 361-370.

Vlckova, K. (2014). Test and Item Fairness (Unpublished master's thesis).

See Also

Useful links:

difNLR documentation built on March 18, 2018, 2:04 p.m.