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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 ?
According to Asyst Chairman and Chief Executive Officer Mihir Parikh, leading OEM suppliers like Ultratech are turning to Asyst in record numbers for their integrated indexer and minienvironment technology, which serves as a vital link in the fabwide proliferation of SMIF.
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To implement key parts of the proposed system, the program enables the following system functions: (a) to load XML-based data (documents) into a MongoDB database, (b) to build field-based and path-based indexers using proceeding titles, article titles, and author names, (c) to allow users to search the documents by matching entered keywords and predicates, and (d) to facilitate the construction of facets based on the ontology in Figure 1.
The pilot promptly noticed the loss of the AOA indexer lights, although normally part of his scan.
His energy must have been tremendous, but his life as an indexer is only briefly chronicled here, so curious readers may wish to pick up the thread in his famous Diary.
When you have successfully completed the tests you will be awarded Accredited Indexer (AI) status, which is recognised as a first stage professional indexing qualification.
The company's previous process included a manual drilling machine and indexer, a bulky jaw chuck, and internal grip clamping fixtures.
Automated equipment for use with RF heat sealers including in-line indexers, rotary turntables, shuttles, temperature-controlled platens, and feeders.
The Troyke single- and dual-axis collet indexers offer pneumatic collet closers, single or multiple (one to four spindles for increased production), and a 0-50-rpm speed range.
Indexers used in this study were double-stranded adaptors composed of a 20-nt common indexer primer annealed to 1 of the 256 individually synthesized 24-nt indexer strands with 4-nt 5'-protruding ends complementary to the 4-nt nonidentical 5' overhangs produced by selected type IIS restriction endonucleases.
She has both the amazing indexing acumen for which members of the American Society of Indexers are known, as well as the sensibilities of personal experience in and dedication to black culture and Literature.
The A2LA certificate assures the customer that Dynisco service employees have correctly calibrated tools and follow an approved and established procedure when calibrating its melt indexers and rheometers.