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Como, Italy
Sept. 19, 2005 to Sept. 22, 2005
ISBN: 0-7695-2371-4
pp: 36
Emilia Mendes , University of Auckland
Chris Lokan , Australian Defence Force Academy
Robert Harrison , University of Auckland
Chris Triggs , University of Auckland
ABSTRACT
<p>Four years ago was the last time the ISBSG database was used to compare the effort prediction accuracy between cross-company and within-company cost models. Since then more than 2,000 projects have been volunteered to this database, which may have changed the trends previously observed. This paper therefore replicates a previous study by investigating how successful a cross-company cost model is: i) to estimate effort for projects that belong to a single company and were not used to build the cross-company model; ii) compared to a within-company cost model. Our within-company data set had data on 184 software projects from a single company and our cross-company data set employed data on 672 software projects.</p> <p>Our results did not corroborate those from the previous study, showing that predictions based on the within-company model were not significantly more accurate than those based on the cross-company model. We analysed the data using forward stepwise regression.</p>
INDEX TERMS
effort estimation, software projects, cross-company estimation models, within-company estimation model, regression-based estimation models, replication study
CITATION
Emilia Mendes, Chris Lokan, Robert Harrison, Chris Triggs, "A Replicated Comparison of Cross-Company and Within-Company Effort Estimation Models Using the ISBSG Database", METRICS, 2005, Software Metrics, IEEE International Symposium on, Software Metrics, IEEE International Symposium on 2005, pp. 36, doi:10.1109/METRICS.2005.4
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