WW doesn't publish it's success/failure rates, but there've been a few studies comparing the effectiveness of various dieting methods.
One recently published found that not-for-profit weight loss groups were just as effective as WW (groups like TOPS, OA, and the bible study group First Place).
but comparing a group to on-your-own is a little different.
Years ago, I read a book - The Unofficial Guide to Dieting Safely by Janis Jibrin
It compared the effectiveness and safety of many weight loss plans. It's out-of-print, but you can still get copies at amazon.com (it's been on my wishlist for some time, as I really liked the book).
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