I don't think the methodology is completely standard, but you generally want an objective way to differentiate between the two forms of attrition. One way to do

I don't think the methodology is completely standard, but you generally want an objective way to differentiate between the two forms of attrition. One way to do it is to define non-regrettable as having documented performance or behavioral issues at the time they decided to leave. Another way would be to do talent surveys to get an evaluation ahead of time.