The first time you turn on Beta Weighting from the View menu, the Beta Reference Index box is displayed. This allows you to select a benchmark index other than the default S&P 500, or manually enter a ticker symbol and define a specific stock as the reference contract.
Note: Reference contracts are associated with a specific portfolio, which means that you can use different reference contracts in your different portfolios.
You can elect to modify the reference contract at any time by clicking the current Beta Reference symbol in the information bar along the bottom of the Risk Navigator.