Volatility, in finance, refers to the wiggliness of the time series. You observe the price of a security go up and down over time. If it changes a lot, that’s high vol: unstable, unpredictable. If it changes only a little, that’s low vol: stable, consistent.

There are many ways to define volatility, just as there are different ways to measure distance. Portfolio variation should be measured with a quasimetric (unidirectional metric).

But for all those definitions, it should mean roughly: the magnitude of change in the price, during some time interval.

(Source: hhttp://www.amazon.com/gp/product/B001Q3M32I?ie=UTF8&tag=hiremebecauim-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=B001Q3M32I)

About isomorphismes

Argonaut: someone engaged in a dangerous but potentially rewarding adventure.
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