A Replicated Comparison of Cross-Company and Within-Company Effort Estimation Models Using the ISBSG Database

Authors:
Emilia Mendes;Chris Lokan;Robert Harrison;Chris Triggs
Affiliations:
University of Auckland;Australian Defence Force Academy;University of Auckland;University of Auckland
Venue:
METRICS '05 Proceedings of the 11th IEEE International Software Metrics Symposium
Year:
2005

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Abstract

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. 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.