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Predicting Defects Using Change Genealogies @ISSRE 2013 7 Aug 2013 | 04:25 pm

When analyzing version histories, researchers traditionally focused on single events: e.g. the change that causes a bug, the fix that resolves an issue. Sometimes however, there are indirect effects t...

Mining and Untangling Change Genealogies – PhD Thesis 11 May 2013 | 03:15 pm

Developers change source code to add new functionality, fix bugs, or refactor their code. Many of these changes have immediate impact on quality or stability. However, some impact of changes may becom...

The Impact of Tangled Code Changes @MSR2013 22 Mar 2013 | 08:29 pm

When interacting with version control systems, developers often commit unrelated or loosely related code changes in a single transaction. When analyzing the version history, such tangled changes will ...

Comparing Boxplot Grid 16 Nov 2012 | 05:11 pm

Hadley Wickham's ggplot2 R package is a very powerful and excellent package. And although the documentation of the package is excellent, things can get complicated. This post explains how to create an...

It’s not a Bug, it’s a Feature: On the Data Quality of Bug Databases 26 Aug 2012 | 03:27 pm

In a manual examination of more than 7,000 issue reports from the bug databases of five open-source projects, we found 33.8% of all issue reports to be misclassified, that is, rather than referring to...

It’s not a Bug, it’s a Feature: On the Data Quality of Bug Databases 26 Aug 2012 | 03:27 pm

In a manual examination of more than 7,000 issue reports from the bug databases of five open-source projects, we found 33.8% of all issue reports to be misclassified, that is, rather than referring to...

Fuzzing with Code Fragments @USENIX Security 2012 27 Apr 2012 | 08:03 pm

Fuzz testing is an automated technique providing random data as input to a software system in the hope to expose a vulnerability. In order to be effective, the fuzzed input must be common enough to pa...

Fixing Google GData Library (1+) 2 Apr 2012 | 10:53 am

Google has many products and projects. The problem is that for many projects, the current version is deprecated and the new one not ready yet. For GData, Google’s library to access core API infrastruc...

Stacked Bar Plots with GGPlot2 15 Mar 2012 | 05:54 am

When plotting contribution shares, pie charts seem to be logic. But pie charts look ugly and do not add much more information than presenting the data in a table. But there is an alterative: stacker b...

―エビデンスが変えるソフトウェア開発 21 Nov 2011 | 11:41 am

The book Making Software is published now also available in Japan language. The article written by Andreas Zeller and myself is translated as 自力でのエビデンスマイニング (Mine your own evidence). Thanks to O’Reil...

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