Abstract: The subjectivity and redundancy of inputs are key obstacles to the application of software cost estimation models. To overcome these obstacles, this paper proposed a method for using software cost estimation model based on metrics tool. By introducing Instrumental Variables, this method could transfer data collected by the metrics tool to inputs of one cost estimation model automatically. This method not only improved the accuracy and reliability of the estimation results by avoiding the subjectivity of the inputs, but also improved the work efficiency of the estimator by reducing the hand operation of the estimator. The feasibility and validity of the method has been further proved by applying a case study.

摘要： 输入的主观性以及输入过多是妨碍软件成本估算模型实际应用效果的重要影响因素。针对以上问题，本文提出了一种基于度量工具的软件成本估算模型使用方法。该方法通过引入统计理论中的工具变量，将度量工具所采集的度量元数据自动转换为软件成本估算模型的输入。这一方面可以避免模型校准和估算过程中输入的主观性与不一致性，提高了估算结果的准确性与可靠性；另一方面能减少估算人员的手工操作，提高工作效率，增加了软件成本估算模型的可用性。本文结合具体实例说明了所提出方法的可行性与有效性。