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beta:
A measure of the volatility, or systematic risk, of a security or a portfolio in comparison to the market as a whole. Beta is used in the capital asset pricing model (CAPM), a model that calculates the expected return of an asset based on its beta and expected market returns. Beta is calculated using regression analysis, and you can think of beta as the tendency of a security's returns to respond to swings in the market. A beta of 1 indicates that the security's price will move with the market. A beta of less than 1 means that the security will be less volatile than the market. A beta of greater than 1 indicates that the security's price will be more volatile than the market. For example, if a stock's beta is 1.2, it's theoretically 20% more volatile than the market.

Unlevered Beta:
A type of metric that compares the risk of an unlevered company to the risk of the market.  The unlevered beta is the beta of a company without any debt. Unlevering a beta removes the financial effects from leverage.  The beta of a leveraged required return; that is, the beta as adjusted for the degree of leverage in the firm's capital structure.

Leveraged Beta:
The beta of a leveraged required return; that is, the beta as adjusted for the degree of leverage in the firm's capital structure.

Adjusted Beta:
An estimate of a security's future beta that involves modifying the security's historical (measured) beta owing to the assumption that the security's beta has a tendency to move over time toward the average beta for the market or the company's industry.

adjusted historical BETA:
An estimate of a security’s future beta. It uses the historical data of the stock, but assumes that a security’s beta moves toward the market average over time. The formula is as follows:
Adjusted beta = (.67) * Raw beta + (.33) * 1.0

学习了,谢谢 5# saviourlee