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Index Model

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Index model
A model of stock returns using a market index such as the S&P 500 to represent common or systematic risk factors.

Single-Index Model
The relationship between a security's performance and the performance of a portfolio containing it. The market model states that the security's performance is related to its portfolio's performance, according to its beta. It is calculated as follows:

Return on security = alpha + beta * return on portfolio + residual return


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