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List of Tables 2.1 The Laws of Software Evolution [175] . . . . . . . . . . . . . 19 3.1 The different types of histories that typically provide input data for studies into software evolution. . . . . . . . . . . . 42 3.2 The criteria that defines an Open Source Software System. 45 3.3 Systems investigated - Rel. shows the total number of distinct releases analyzed. Age is shown in Weeks since the first release. Size is a measure of the number of classes in the last version under analysis. . . . . . . . . . . . . . . . . 52 4.1 Structure of a compiled Java Class. Items that end with an * indicate a cardinality of zero or more [180]. . . . . . . 75 4.2 Direct count metrics computed for both classes and interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 4.3 Metrics computed by processing method bodies of each class. The mapping between these measures and the bytecode is presented in Appendix C. . . . . . . . . . . . . . . . 80 4.4 Flags extracted for each class. . . . . . . . . . . . . . . . . . 81 4.5 Dependency metrics computed for each class. . . . . . . . . 85 4.6 Inheritance metrics computed for each class. . . . . . . . . 87 5.1 Collected measures for distribution and change analysis using the Gini Coefficient . . . . . . . . . . . . . . . . . . . . 103 xvii
List of Tables 5.2 Spearman’s Rank Correlation Coefficient values for one version (0.3.0) of JasperReports. Strong correlation values are highlighted. . . . . . . . . . . . . . . . . . . . . . . . 109 5.3 Gini value ranges in Spring Framework across 5 years of evolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 5.4 Sample of observed significant changes to Gini coefficients in consecutive releases. . . . . . . . . . . . . . . . . . . . . . 128 A.1 Meta data captured for each software system . . . . . . . . 199 C.1 Metrics are computed by processing opcodes inside method bodies of each class. . . . . . . . . . . . . . . . . . . . . . . . 201 E.1 Data files used in the study of Growth (Chapter 5) . . . . . 204 F.1 Data files used in the study of Change (Chapter 6) . . . . . 206 xviii
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Chapter 8. Conclusions • We prese
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Appendix A Meta Data Collected for
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Appendix C Mapping between Metrics
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Chapter D. Metric Extraction Illust
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Appendix F Change Dynamics Data Fil
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References [1] S. Alam and P. Duger
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References Software. In Proceedings
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References [43] N. Chapin, J. Hale,
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References [68] M. Di Penta, L. Cer
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References [91] C. Gini. Measuremen
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References [115] I. Held. The Scien
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References [140] H. Kagdi, S. Yusuf
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References [164] M. Lanza, H. Gall,
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References [266] G. Succi, W. Pedry
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References ECOOP Workshop on Quanti
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References [315] T. Zimmermann, V.
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