Test equating and model application

To test the same quality, but use different tests to compare, the first thing is equivalent. Many selections and exams are considering test inequality, so equal tests before comparison. In domestic, the research of test equating is seldom, and in these few studies only few models had been studied -Classical Test Theory and Item Response Theory. Among these test equating models include Rasch Model, this article will illustrate test equivalent and functions of different models in detail.