GMAT                    Dichotomous dataset based on GMAT with the same
                        total score distribution for groups.
GMAT2                   Dichotomous dataset based on GMAT.
GMAT2key                Key of correct answers for 'GMAT2test' dataset.
GMAT2test               Dataset based on GMAT.
GMATkey                 Key of correct answers for 'GMATtest' dataset.
GMATtest                Dataset based on GMAT with the same total score
                        distribution for groups.
MLR                     DDF likelihood ratio statistics based on
                        multinomial log-linear regression model.
MSATB                   Dichotomous dataset of Medical School Admission
                        Test in Biology.
MSATBkey                Key of correct answers for 'MSATBtest' dataset.
MSATBtest               Dataset of School Admission Test in Biology.
NLR                     DIF statistics for non-linear regression
                        models.
ORD                     DIF likelihood ratio statistics for ordinal
                        data.
coef.ddfMLR             Extract model coefficients from an object of
                        '"ddfMLR"' class.
coef.difNLR             Extract item parameter estimates from an object
                        of the '"difNLR"' class.
coef.difORD             Extract model coefficients from an object of
                        '"difORD"' class.
ddfMLR                  DDF detection for nominal data.
difNLR                  DIF detection using non-linear regression
                        method.
difNLR-package          DIF and DDF Detection by Non-Linear Regression
                        Models.
difORD                  DIF detection among ordinal data.
estimNLR                Non-linear regression DIF models estimation.
fitted.difNLR           Fitted values and residuals for an object of
                        the '"difNLR"' class.
formulaNLR              Creates a formula for non-linear regression DIF
                        models.
genNLR                  Generates data set based on generalized
                        logistic regression DIF and DDF models.
logLik.ddfMLR           Log-likelihood and information criteria for an
                        object of '"ddfMLR"' class.
logLik.difNLR           Log-likelihood and information criteria for an
                        object of the '"difNLR"' class.
logLik.difORD           Log-likelihood and information criteria for an
                        object of '"difORD"' class.
plot.ddfMLR             ICC plots for an object of '"ddfMLR"' class.
plot.difNLR             ICC and test statistics plots for an object of
                        the '"difNLR"' class.
plot.difORD             ICC plots for an object of '"difORD"' class.
predict.ddfMLR          Predicted values for an object of '"ddfMLR"'
                        class.
predict.difNLR          Predicted values for an object of the
                        '"difNLR"' class.
predict.difORD          Predicted values for an object of '"difORD"'
                        class.
startNLR                Calculates starting values for non-linear
                        regression DIF models.
