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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 ?
In a sense, the indexer has to master the art of being indifferent, of producing an 'a-moral' order.
When the airplane reaches the near maximum limit AoA, the indexer will display two flashing red LEDs and sound an increasing frequency of the Geiger counter-like audio (if it's wired into the aircraft audio panel and or pilot headset audio.
First we retrieve the list of proceedings matching the key words "object database Wang" based on a path-based indexer.
Metrics for indexer: This section defines some important measurements for the indexer component of the architecture.
Bell's final section on the Society of Indexers and its activities will help to promote interest in this field, though I wish that she had captured some of the important implications of computer-generated indexes.
The SI course covers advice on setting up as a freelance indexer and finding work.
The fact that one of the software tools for Web site indexing, called XRefHT32, (4) is poorly documented freeware prompted a British indexer to write a user manual for this software.
The concentration of each indexer stock solution was 10 [micro]mol/L.
A cam indexer advances the fixtured component through separate blasting and airwash chambers in the cabinet before returning the finished component to the unloading position at the front of the machine.
For this assumption to prove accurate, the site Webmaster must have complete confidence in the indexer to allow him or her to upload to the site revised files with additional HTML tags (named anchors or HTML Indexer tags), and the Webmaster has to be completely aware of updates so that she can alert the indexer to make edits.
Many thanks to our indexer, Barbara DeGennaro, one the many valuable and skilled African American professionals who serve our cultural institutions.
Stellent Audio Video Indexer is a new module in Stellent, Inc.