R (>= 3.2.2), CTT, ggplot2 (>= 2.2.1), methods, msm, nnet,
reshape2, stats

DIF and DDF Detection by Non-Linear Regression Models
c(person("Adela", "Drabinova", role = c("aut", "cre"), email = "drabinova@cs.cas.cz"), person("Patricia", "Martinkova", role = "aut"), person("Karel", "Zvara", role = "aut"))
Adela Drabinova [aut, cre],
Patricia Martinkova [aut],
Karel Zvara [aut]
R (>= 3.1), CTT, ggplot2 (>= 2.2.1), methods, msm, nnet,
reshape2, stats
Detection of differential item functioning (DIF) among dichotomously scored items and differential distractor functioning (DDF) among unscored items with non-linear regression procedures based on generalized logistic regression models (Drabinova and Martinkova, 2017, <doi:10.1111/jedm.12158>).

c(person("Adela", "Hladka", role = c("aut", "cre"), email = "hladka@cs.cas.cz"), person("Patricia", "Martinkova", role = "aut"), person("Karel", "Zvara", role = "ctb"))
Adela Hladka [aut, cre],
Patricia Martinkova [aut],
Karel Zvara [ctb]
CTT, ggplot2 (>= 2.2.1), grDevices, methods, msm, nnet, plyr,
reshape2, stats, VGAM
Detection of differential item functioning (DIF) among dichotomously scored items and differential distractor functioning (DDF) among unscored items with non-linear regression procedures based on generalized logistic regression models (Drabinova and Martinkova, 2017, doi:10.1111/jedm.12158).

calculus, CTT, ggplot2 (>= 2.2.1), grDevices, methods, msm,
nnet, plyr, reshape2, stats, VGAM
Detection of differential item functioning (DIF) among dichotomously scored items and differential distractor functioning (DDF) among unscored items with non-linear regression procedures based on generalized logistic regression models (Drabinova & Martinkova, 2017, <doi:10.1111/jedm.12158>).

calculus, ggplot2 (>= 2.2.1), msm, nnet, plyr, stats, VGAM
Detection of differential item functioning (DIF) among dichotomously scored items and differential distractor functioning (DDF) among unscored items with non-linear regression  procedures based on generalized logistic regression models (Hladka & Martinkova, 2020, <doi:10.32614/RJ-2020-014>).