Old school technical analysts use the 50 day moving average/200 day moving average crossover as a timing tool. The 50 day represents the short term trend, the 200 day the long term. When the 50 day crosses over the 200 day that is a buy signal. Here is a two-year chart on SPY (link).
Over at the VIX and More blog, Bill Luby writes about a VIX sell signal (link2). VIX is a sentiment indicator. Luby does a lot of work refining and backtesting on what actually generates good trading signals, because the raw VIX numbers typically do not.
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