For those who don't follow Darrow Kirkpatrick this new post may give you incentive to do so. I don't fully understand the implications of this post and it sounds like it's a work in progress, but this is obviously cutting-edge stuff when it comes to looking at real-world SWR's.
Retirement Calculator News, and a Mystery Solved… - Can I Retire Yet?
Retirement Calculator News, and a Mystery Solved… - Can I Retire Yet?