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Statistical composite that measures changes in the economy or in financial markets, often expressed in percentage changes from a base year or from the previous month. Indexes measure the ups and downs of stock, bond, and some commodities markets, in terms of market prices and weighting of companies in the index.


A statistical measure of the value of a certain portfolio of securities. The portfolio may be for a certain class of security, a certain industry, or may include the most important securities in a given market, among other options. The value of an index increases when the aggregate value of the underlying securities increases, and decreases when the aggregate value decreases. An index may track stocks, bonds, mutual funds, and any other security or investment vehicle, including other indices. An index's value may be weighted; for example, securities with higher prices or greater market capitalization may affect the index's value more than others. One of the most prominent examples of an index is the Dow Jones Industrial Average, which is weighted for price and tracks 30 stocks important in American markets.


The relative value of a variable in comparison with itself on a different date. Many security price indicators such as the Standard & Poor's series and the New York Stock Exchange series are constructed as indexes. Also called stock index. See also base period.


To adjust a variable by a selected measure of relative value. For example, it has been proposed that an investor's basis on a security be indexed for changes in consumer prices so that only real increases in value will be taxed. Also called tax indexing. See also subindex.


An index reports changes up or down, usually expressed as points and as a percentage, in a specific financial market, in a number of related markets, or in an economy as a whole.

Each index -- and there are a large number of them -- measures the market or economy it tracks from a specific starting point. That point might be as recent as the previous day or many years in the past.

For those reasons, indexes are often used as performance benchmarks against which to measure the return of investments that resemble those tracked by the index.

A market index may be calculated arithmetically or geometrically. That's one reason two indexes tracking similar markets may report different results. Further, some indexes are weighted and others are not.

Weighting means giving more significance to some elements in the index than to others. For example, a market capitalization weighted index is more influenced by price changes in the stock of its largest companies than by price changes in the stock of its smaller companies.


(1) A statistical indicator that measures changes in the economy in general or in particular areas.An example is the cost-of-living index.(2) A reference point against which measurements are taken for purposes of making future adjustments.An adjustable-rate mortgage might begin with an interest rate of 6 percent and provide that it will increase or decrease in a like percentage as the increase or decrease between today's quoted price for 10-year U.S.Treasury bonds and the price on the loan's annual anniversary date.We would say that 10-year T-bonds are the index.

Some leading loan indices include

• Wall Street Journal prime
• Federal discount rate
• Fed funds rate
• 11th District Cost of Funds
• 10-year Treasuries
• One-year LIBOR

References in periodicals archive ?
LSI Corporation (Nasdaq:LSI) designs semiconductors and software that accelerate storage and networking in datacenters, mobile networks and client computing.
Although the operations supporting the War on Terror had not yet commenced when the Army made the decision to use an LSI, the manpower drains that it caused across the Army would have widened the capability gap even further.
LSI packages can be made so small that their outer dimensions are no large than those of the chip itself.
LSI Logic Corporation (NYSE: LSI) is a leading provider of silicon-to-systems solutions that are used at the core of products that create, store and consume digital information.
The first LCD driver IC from Tomato LSI to feature PenTile RGBW technology is a mere 21.
Recognizing that LSI is at the forefront of storage technology, Nimbus chose its SAS technology for its flexible adapter options as well as its broad range of SAS controller and expander silicon solutions, according to Thomas Isakovich, President and CEO of Nimbus Data Systems.
On the basis of the closing price of WorkPlace Ordinary Shares on September 16, 2005, LSI was acquired for $6 million in a combined share and cash transaction.
Shiva Ramesh, Senior Engineering Director in the Custom Solutions Group at LSI.
Ultimately, the output and energy savings, along with the facility for complete control over color temperature and intensity, will make LEXEL(TM)-based LSI fixtures the light source of choice for museums, galleries and stores.
LSI Logic has long been an official DivX partner, with a number of DivX Certified IC solutions, and was among the first companies to offer a DivX Certified Encoding solution to power DVD recorder and DVR devices.
With technological development investment from NTT DoCoMo since July 2004, the jointly developed LSI is expected to promote the global use of FOMA(R) and similar 3G mobile handsets.
We share a common mission with LSI Logic to enable designer productivity and speed time to market," said Andy Haines, vice president of marketing, Synplicity.