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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 ?
A human indexer does far more than simply categorize.
No doubt, this book has more value to indexers than it does to technical writers.
Showing range of tensile, compression, and flexural testing machines, impact testers, and melt indexers.
and Nancy Davidson of The Brookings Institution Press, Although these publishers do not specialize in technical documentation, their discussion of finding freelance indexers, the style guidelines they use, their editing process, their expectations when contracting freelance indexers, and their payment methods are comparable to many other publishers' practices.
Professional indexers have been creating these lists for many years.
Weinberg's reviews of the out-of-print books provide a valuable resource for indexers.
The new article by Anne Leach does not have a "gender-neutral" style (Leach seems to think that all indexers are women); however, it contains solid guidelines for freelancers who may find marketing and promotional activities distasteful.
Today, there are excellent indexers and rotary tables available that provide exceptional accuracy and rigidity.
com provides a number of value-added case management services including shared calendars, collaborative document libraries, email utilities, custom web content indexers, and electronic discovery applications.
Accessories include side-to-side shuttles, rotary and in-line indexers, and heated platens.
While the relative simplicity of this test has remained the same, melt indexers have evolved considerably since they appeared in the 1950s.
0 is especially good at managing scanned documents, computer output (COLD), AutoCAD drawings, PDF, Microsoft Office files and other popular data types that are both difficult and costly to manage within relational databases, Intranet indexers, or enterprise document management systems.