A shift-invariant morphological system for software development cost estimation

Authors:
Ricardo de A. Araújo;Adriano L. I. Oliveira;Sergio Soares
Affiliations:
Intelligent Computing Department, RiA Prediction Systems, Recife, PE, Brazil;Informatics Center, Federal University of Pernambuco, Recife, PE, Brazil;Informatics Center, Federal University of Pernambuco, Recife, PE, Brazil
Venue:
Expert Systems with Applications: An International Journal
Year:
2011

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Abstract

Abstract: This work presents a shift-invariant morphological system to solve the problem of software development cost estimation (SDCE). It consists of a hybrid morphological model, which is a linear combination between a morphological-rank (MR) operator (nonlinear) and a Finite Impulse Response (FIR) operator (linear), referred to as morphological-rank-linear (MRL) filter. A gradient steepest descent method to adjust the MRL filter parameters (learning process), using the Least Mean Squares (LMS) algorithm, and a systematic approach to overcome the problem of non-differentiability of the morphological-rank operator are used to improve the numerical robustness of the training algorithm. Furthermore, an experimental analysis is conducted with the proposed system using the NASA software project database, and in the experiments, two relevant performance metrics and an evaluation function are used to assess its performance. The results obtained are compared to models recently presented in literature, showing superior performance of this kind of morphological systems for the SDCE problem.