SPX'S WEEKLY MA 21/50/100 (1950s-2020) Crash confirmation
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with too many signals, I could be wrong . but, this also should only be used as a crash confirmation tool nothing more. maybe in the future, we shall find more interesting things about it. we shall see.
wish you all the best.
註釋
Investopedia : (very important)...LAGGING
All moving averages have a significant drawback in that they are LAGGING INDICATORS. Since moving averages are based on prior data, they suffer a time lag before they reflect a change in trend. A stock price may move sharply before a moving average can show a trend change. A shorter moving average suffers from less lag than a longer moving average.