They aren't definitive numbers, but Pete Deemer and Gabrielle
Benefield's great summary of Scrum at Yahoo! Concludes with a couple
of stats that indicate happier and therefore lower attrition amongst
"85% of team-members stated that they would continue using Scrum if
the decision were solely up to them."
"Team Morale: 52% of respondents reported Scrum is better or much
better; 9% reported Scrum is worse or much worse; 39% reported Scrum
is about the same."
I hope that helps a little.
--- In email@example.com
> Hi all,
> I've looked high and low and can not find any statistical studies done
> on attrition rates of established agile teams. I've found plenty of
> anecdotal evidence, but nothing from a study. Has anyone seen any
> definitive numbers anywhere?