以下是文献的摘要，附件中有R的代码和R的包，大家只要把R包放在你安装的R的软件的地方，然后通过本地，就可以加载分析了。

The R package equateIRT implements item response theory (IRT) methods for equating different forms composed of dichotomous items. In particular, the IRT models included are the three-parameter logistic model, the two-parameter logistic model, the one-parameter logistic model and the Rasch model. Forms can be equated when they present common items (direct equating) or when they can be linked through a chain of forms that present common items in pairs (indirect or chain equating). When two forms can be equated through different paths, a single conversion can be obtained by averaging the equating coefficients. The package calculates direct and chain equating coefficients. The averaging of direct and chain coefficients that link the same two forms is performed through the bisector method. Furthermore, the package provides analytic standard errors of direct, chain and average equating coefficients.