Gear Head: How to Get a Better Read on Beta

When calculating risk, you can use all kinds of tools to compare a stock's current volatility to its past volatility. However, one of our favorites is fast beta.

Print
https://tickertapecdn.tdameritrade.com/assets/images/pages/md/fast beta chart indicator thinkorswim
2 min read

When calculating risk, you can use all kinds of tools to compare a stock’s current volatility to its past volatility. However, one of our favorite charting indicators in thinkorswim®—beta—allows you to compare a stock’s volatility to the volatility of a market index, such as the S&P 500 (SPX), the Dow 30 (DJX), the Nasdaq 100 (NDX), or the Russell 2000 (RUT).

Consider a little refresh. Compared to the S&P 500, say a stock has a beta of 1.25, and the S&P 500 moves up 1%. So, theoretically, the stock would move up 1.25%. But you think it could be a little better—more useful. How? By creating “fast beta.”

undefined

FIGURE 1: FAST BETA, PLEASE. When trading shorter-term volatility, the fast-beta indicator in thinkorswim Charts can provide more relevant information than regular beta. For illustrative purposes only. Not a recommendation.

Old vs. New

The downside of using regular beta when trading shorter-term vol is that it uses a long set of price data that is unweighted, thereby considering older price movements as equally valid to more recent price movements. This discounts the possibility that current volatility might be significantly different relative to the long term. So, in effect, fast beta places more emphasis on recent price movements and requires less historical data. The interpretation of fast beta is roughly the same as that of regular beta. But keep in mind that the time over which we measure is shorter, which might work better when calculating, say, a hedge on a short-term trade.

The “modified” portion that gets us to fast beta is the use of a weighted moving average instead of a simple moving average. Using a weighted moving average gives fast beta a calculation more sensitivity to recent price movements in a security, as well as in its benchmark.

Just like beta, fast beta measures the systematic risk of a security, and the sensitivity of that security's returns to market returns. As well, a benchmark "market" is selected and defined to have a fast beta equal to 1.0. Just like beta, stocks with fast beta greater than 1.0 are more volatile than the market. Whereas those with lower fast beta are less volatile. In short, if a security has a fast beta of 2, and the market is down 10%, the security is expected to be down 20%. Stocks with fast beta equal to 1.0 are said to move with the market.

How To Find It:

1/ Go to the Charts tab on thinkorswim.

2/ Enter a symbol and press <enter> to pull up a chart.

3/ In the upper right, above the chart, click Studies>Add Studies>Alpha Studies>FastBeta.

The default index used to compare is SPX. However, you can choose one of the other four main indices (NDX, RUT, DJX, and Nasdaq Composite) through the “Edit Studies” under the studies menu as well.

Call Us
800-454-9272

adChoicesAdChoices

Market volatility, volume, and system availability may delay account access and trade executions.

Past performance of a security or strategy does not guarantee future results or success.

Options are not suitable for all investors as the special risks inherent to options trading may expose investors to potentially rapid and substantial losses. Options trading subject to TD Ameritrade review and approval. Please read Characteristics and Risks of Standardized Options before investing in options.

Supporting documentation for any claims, comparisons, statistics, or other technical data will be supplied upon request.

The information is not intended to be investment advice or construed as a recommendation or endorsement of any particular investment or investment strategy, and is for illustrative purposes only. Be sure to understand all risks involved with each strategy, including commission costs, before attempting to place any trade. Clients must consider all relevant risk factors, including their own personal financial situations, before trading.

This is not an offer or solicitation in any jurisdiction where we are not authorized to do business or where such offer or solicitation would be contrary to the local laws and regulations of that jurisdiction, including, but not limited to persons residing in Australia, Canada, Hong Kong, Japan, Saudi Arabia, Singapore, UK, and the countries of the European Union.

TD Ameritrade, Inc., member FINRA/SIPC. TD Ameritrade is a trademark jointly owned by TD Ameritrade IP Company, Inc. and The Toronto-Dominion Bank. © 2018 TD Ameritrade.

Scroll to Top