如我要说明的，项目参数估计中偏差的减少是管理动态系统开发的关键。
As I will show, reduction of variance in the estimates of project parameters is the key to managing the dynamics of system development.
很明显，随着项目参数估计中方差的增加，成功完成项目的可能性就减少。
Clearly, as the variance in the estimates of project parameters increases, the likelihood of completing the project successfully decreases.
本论文共分三章，主要内容安排如下：第一章简单介绍了项目反应理论模型和几种常见的参数估计的方法。
This paper is divided into three chapters, the content is as follows: chapter I simply introduces the model of the item response theory and some useful methods of parameter estimation.
主要讨论二级评分项目的参数估计，提出了一种二级评分项目的参数解法，并对该方法的收敛性进行了证明。
This paper discusses the estimation of scoring item parameters. The solutions of parameters are gained and the convergence of solutions is proved.
然后，基于项目反应理论、结合参数估计算法，提出了一种结合项目能力值的参数估计算法。
Then we presents a new Parameter Evaluation Algorithm (PEA) taking account of the value of item capacity, based on IRT and Parameter Evaluation Algorithm.
未来的研究可以深入探讨各种组合方法对模型拟合以及参数估计的影响以及项目组合在一些SEM高阶应用中的效果，并进一步与项目反应理论等测量理论相结合。
Future research can focus on the impact of various parceling methods on the model fit and estimates, or the application of parceling in advanced SEM procedures and other measurement theories.
本文首先在介绍了三种教育测量理论的基础上，较详细地论述了项目反应理论的基本原理、模型、参数估计以及信息函数等。
In the thesis, the basic principle, model, parameter estimation and information function of IRT are discussed based on three education test theories.
这种新方法有以下三个优点：①项目数很少时参数估计的结果也较稳定；
There are three advantages about the new method: first . the new method can be applied to estimate fewer items;
这种新方法有以下三个优点：①项目数很少时参数估计的结果也较稳定；
There are three advantages about the new method: first . the new method can be applied to estimate fewer items;
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