Random Roger writes about some warning flags (link) pointed out by John Hussman, then adds this:
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Bear markets come so infrequently that guessing on the next one in a meaningful way is like to be the wrong trade.

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I see this as similar to short term traders trying to call a top, instead of selling after a top is in place. Roger is waiting for the indexes to break their 200 day moving averages, something that some folks use as an indicator of the long term trend.