'Empirical Data on Refactoring?

Are there any empirical studies that show the impact of refactoring (or lack of refactoring) on a development team's productivity?

(NOTE: I'm only looking for empirical data--From my own experience, I personally know that refactoring works, but I was wondering if there was some hard data to back that claim).



Solution 1:[1]

This article looks to have the info you seek.

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Solution Source
Solution 1 Chris Ballance