Variability in project size and developer capability and … [ref]. The effects of tools and process are often smaller by … When studying tool effects … one chooses developers who make similar numbers of … , it is important to select developers who … version-history data available, these tasks are often easy: … [p. 173] We used relatively large samples of MR's … [modification requests] … [6,985 MR's over 72 months by 18 developers when comparing subsystems, 3,438 MR's over 72 months by 9 developers when analyzing tool benefits]
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