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That was exactly my point at http://news.ycombinator.com/item?id=4040022 and it is a valid one.

However I have been thinking about it since, and it is possible to design a multi-armed bandit approach with logarithmic regret (though higher by a constant factor than a traditional approach), that can handle the varying performance ratio. It also would allow you to add variations at any time.

There remain operational differences, but this problem is fixable.

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