Two of the stock market's most accurate historical signals -- one bearish and one bullish -- are currently butting heads. The conflicting signs have left many investors confused about what to do, but the answer is actually very simple: Remain invested, dollar-cost average into index exchange-traded funds (ETFs) such as the Vanguard S&P 500 ETF (NYSEMKT: VOO), and avoid trying to time the market. However, before I explain this strategy, let's look at the two conflicting market signals that have been nearly 100% accurate in the past. The cyclically adjusted price-to-earnings (CAPE) ratio has climbed above 30 only five times before, and each time saw the stock market subsequently crash.
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