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21. How Effective Is Modularization? > Threats to Validity

Threats to Validity

The primary construct in our study is the use of bug reports as the logical unit of change to the analyzed systems. The first threat to the validity of this construct comes from the simple pattern-matching technique we use to associate commits with bug reports based on their description field. This technique does not guarantee that all of the links between bug reports and commits are found; some commit descriptions may report the associated bug ID in a nonstandard format that is missed by our regular expression, whereas other commits may describe the bug they address without explicitly mentioning the bug ID. In particular, we were only able to match approximately 20% of the commits ....


  

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