Empirical Confirmation (and Refutation) of Presumptions on Software

Details Empirical Confirmation (and Refutation) of Presumptions on Software Empirical Confirmation (and Refutation) of Presumptions on Software

2012-01-15

arxiv.org/abs/1201.3078v1

Computer Science

Software Engineering

Scientific paper

Code metrics are easy to define, but not so easy to justify. It is hard to prove that a metric is valid, i.e., that measured numerical values imply anything on the vaguely defined, yet crucial software properties such as complexity and maintainability. This paper employs statistical analysis and tests to check some "believable" presumptions on the behavior of software and metrics measured for this software. Among those are the reliability presumption implicit in the application of any code metric, and the presumption that the magnitude of change in a software artifact is correlated with changes to its version number. Putting a suite of 36 metrics to the trial, we confirm most of the presumptions. Unexpectedly, we show that a substantial portion of the reliability of some metrics can be observed even in random changes to architecture. Another surprising result is that Boolean-valued metrics tend to flip their values more often in minor software version increments than in major increments.

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