GMAT                    Dichotomous Data Set Based on Graduate
                        Management Admission Test
GMATkey                 Key of Correct Answers for 'GMATtest' Data Set
GMATtest                Data Set Based on Graduate Management Admission
                        Test
difNLR                  Non-Linear Regression DIF Method
difNLR-package          Detection of Dichotomous Differential Item
                        Functioning (DIF) by Non-Linear Regression
                        Function
startNLR                Calculates Starting Values
