First , one main work of test equating is to estimate equating coefficients , in the paper in the light of item response theory an abstract form is introduced , which makes all test equating methods in uniform , by the abstract form , the relationships among the existed methods being found out , and some new methods being derived , including relative entropy equating method and logcontrast equating method 本文在项目反应理论( itemresponsetheory , irt )框架下提出了一种抽象形式将目前已有的各种等值系数估计方法统一表示，通过统一表示找出了各种等值方法之间的关系，并导出了几种新的等值方法，其中包括相对熵( relativeentropy )等值法和对数对照( logcontrast )等值法。
