[gbraad]

Commit times do not necessarily convey the correct information; in the worst case i could have worked two days on a commit, or even commit it the following day. Time zones are also not accurate when travelling is involved for a developer/engineer or eg. Is it even correctly set. I believe evidence comes from first hand, conversation or questionaire

[forensic]

The social science approach would be to use both. Detailed case studies are essential and should be the starting point. But hypotheses extrapolated from those case studies could then be examined with statistical analysis like this.