Constructing one scale to describe two statewide exams.

This study applies two approaches in creating a single scale from two separate statewide exams (Golden State Math Exam and California Standard Math Test) and compares some aspects of the two statewide tests. The first analysis involves a sequence of unidimensional Rasch scalings, using anchored items to scale the two tests together. The second analysis employs a 2-dimensional Rasch scaling using previous unidimensional analysis results to link the scales. The linking facilitates the investigation of their measurement properties of the two exams and is a basis for combining items from both exams to develop a more efficient testing program. The results of the comparisons of the two statewide exams based on the linking are shown and discussed.