Historic Volatility and Volatility Bands
Reading volatility is yet another subjective exercise.
There are two primary ways I look at volatility:
1. I observe volatility from a historic perspective.
2. I look at volatility for the application of bands to intraday charts, for use as a timing mechanism, and for the definition of short-term pivot points.
Looking at historic volatility, the intent is to learn something about the trending characteristics, or lack thereof, exhibited by a market. I do this by comparing historic volatilities over multiple time frames.
A market where the 21-day volatility is rising and is higher than the 50-day volatility that is also rising, and has just moved above the 100-day measure would be signaling an acceleration in whatever direction it was moving.
The subjective nature extends from the fact that a volatility alignment such as the one just described could define either a significant trend reversal in the making, following a prolonged low-volatility trend or a fresh breakout and newborn trend in the making, extending from a sideways, nontrending market.
In the first case, I might look to employ some countertrend techniques on a low risk, shorter-term speculative basis. Or, as an investor, I might seek to tighten my stop-order protection. This would most likely occur where giveback is intensifying, in terms of holding what is still a longer-term profitable investment, but where the reversal is accelerating and causing pain.
In the second ...

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