Understanding Beta in Finance: Calculation, Stability, and Determinants
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The Company Beta (β)
β = Cov(Ri, RM) / Var(RM)
Problems of Beta:
- Betas may vary over time.
- The sample size may be inadequate.
- Betas are influenced by changing financial leverage and business risk.
Solutions:
- Problems 1 and 2 can be moderated by more sophisticated statistical techniques.
- Problem 3 can be lessened by adjusting for changes in business and financial risk.
- Look at average beta estimates of several comparable firms in the industry.
Stability of Beta
Most analysts argue that betas are generally stable for firms remaining in the same industry, but they can change due to:
- Changes in product line
- Changes in technology
- Deregulation
- Changes in financial leverage
Using an Industry Beta
It is frequently argued that one can better estimate a firm's beta... Continue reading "Understanding Beta in Finance: Calculation, Stability, and Determinants" »