y = α + βx - Deepstash

y = α + βx

Here α is the symbol for alpha, β stands for beta, and x is the return of the market. Th e market- related return of the portfolio is equal to its beta times the market return, and alpha (skill- related return) is added to arrive at the total return (of course, theory says there’s no such thing as alpha).

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Beta and alpha [y = α + βx]

  • One is beta, a measure of a portfolio’s relative sensitivity to market movements.
  • The other is alpha, which I define as personal investment skill, or the ability to perform that is unrelated to movement of the market.

portfolio with a beta above...

If we’re consistently able to decline less when the market declines and also participate fully when the market rises, this can be attributable to only one thing: alpha, or skill.

That’s an example of value- added investing, and if demonstrated over a period of decad...

Of course, I also dismiss the idea that the alpha term in the equation has to be zero. Investment skill exists, even though not everyone has it. Only through thinking about risk- adjusted return might we determine whether an investor possesses superior insight, investment skill or alpha . . . tha...

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