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Title: Integrating non-parametric models with linear components for producing software cost estimations
Authors: Mittas, Nikolaos 
Papatheocharous, Efi 
Angelis, Lefteris 
Andreou, Andreas S. 
Major Field of Science: Engineering and Technology
Field Category: Electrical Engineering - Electronic Engineering - Information Engineering
Keywords: Semi-parametric models;Software cost estimation
Issue Date: Jan-2015
Source: Journal of Systems and Software, 2015, vol. 99, pp. 120-134.
Volume: 99
Start page: 120
End page: 134
Journal: Journal of Systems and Software 
Abstract: All rights reserved.A long-lasting endeavor in the area of software project management is minimizing the risks caused by under- or over-estimations of the overall effort required to build new software systems. Deciding which method to use for achieving accurate cost estimations among the many methods proposed in the relevant literature is a significant issue for project managers. This paper investigates whether it is possible to improve the accuracy of estimations produced by popular non-parametric techniques by coupling them with a linear component, thus producing a new set of techniques called semi-parametric models (SPMs). The non-parametric models examined in this work include estimation by analogy (EbA), artificial neural networks (ANN), support vector machines (SVM) and locally weighted regression (LOESS). Our experimentation shows that the estimation ability of SPMs is superior to their non-parametric counterparts, especially in cases where both a linear and non-linear relationship exists between software effort and the related cost drivers. The proposed approach is empirically validated through a statistical framework which uses multiple comparisons to rank and cluster the models examined in non-overlapping groups performing significantly different.
ISSN: 0164-1212
DOI: 10.1016/j.jss.2014.09.025
Rights: © Elsevier
Attribution-NonCommercial-NoDerivs 3.0 United States
Type: Article
Affiliation : Aristotle University of Thessaloniki 
Malardalens hogskola 
Cyprus University of Technology 
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