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| Twice Regression Learning and Its Application on Software Effort Estimation |
| YANG Zi-Xu, LI Ming |
| State Key Laboratory for Novel Software Technology, Nanjing University, Nanjing 210023 |
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Abstract Regression learning belongs to supervised learning, which is to build models on examples with real-valued labels. It usually needs a great amount of training samples to obtain significant performance. However, there are few training samples that can be collected in real applications. Aiming at this problem, the neural network ensemble to regression tree(NERT) algorithm is proposed based on the twice learning framework. By means of the virtual sample generation technique, this method makes effective utilization of two sequential learning stages to relieve the problem of insufficient training samples for enhancing its performance. By choosing two methods with high generalization ability and significant comprehensibility respectively for the two stages, a model with two characteristics can be obtained. Results on software effort estimation with few training samples show that NERT is capable of achieving better performance from these small data than existing methods, and reveals the key factors within effort estimation effectively due to its inherent comprehensibility.
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Received: 13 May 2013
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2015, Vol. 28 
