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Actually, there is a formal measurement of a stocks volitiliy called it's beta. http://en.wikipedia.org/wiki/Beta_(finance) http://en.wikipedia.org/wiki/Beta_(

• john_b 13y ago
  Beta is one of many measures of volatility. Since it's a normalized correlation between the stock's rate of return and that of the market, it only really has meaning in the context of a stock's performance over a long time or in relation to the market as a whole. A stock's performance post-earnings is about as market-independent as you can get, however.
• foobarqux 13y ago
  The formal measurement of a stock's volatility is its volatility.