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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.
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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.
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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.
Wall Street Words: An A to Z Guide to Investment Terms for Today's Investor by David L. Scott. Copyright © 2003 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. All rights reserved.


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.

Dictionary of Financial Terms. Copyright © 2008 Lightbulb Press, Inc. All Rights Reserved.


(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

The Complete Real Estate Encyclopedia by Denise L. Evans, JD & O. William Evans, JD. Copyright © 2007 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The authors thank the parents of the index case, who consented to publication of this case report, the clinicians who cared for the index baby in the paediatric intensive care unit (Dr Noor Parker and Prof.
The reported cases displayed a characteristic epidemic curve with a single wave and peaked at epidemiologic week 33, eleven weeks after the index case (Figure 2).
The sociodemographic characteristics and medical history of index cases, such as a result of smear microscopy, HIV status, residential address, and telephone number, were recorded.
In our study, the seroprevalence rate of brucellosis in family members of pediatric index cases was 36.8%.
We are thankful to the Faculty of Pediatrics of LUMHS and Chest specialists of Kori Institute of Chest Diseases for allowing us to collect data and provision of diagnostic and management facilities to the index cases and clinical suspects of our study.
Even more significant is the fact that 16 of 26 cases amongst children (61-5%) had contact with an index case, showing that contact examination would have a large impact on early case detection in children, thus greatly reducing the risk of disability in children.
After the Index case, we identified 8 patients who got admitted in the ICU over a period of 14 weeks who fulfilled the inclusion criterion, to be categorized as part of an outbreak.
d--Other parameters: The nuclear family of the index case (child), the nuclear family of the index case (marital), the nuclear family of father and mother's index case.
In addition to the index case (see above), six standardised case vignettes of patients with different combinations of primary and secondary diagnoses, procedures, age and length of stay were defined (Table 2).
In our index case, presentation was bilateral (warmer induced injury should be unilateral), almost symmetrical, with clear line of demarcation as in dry gangrene and amputations of digits was required.
"The fourth death recorded today was a Nigerian nurse who participated in the initial management of the index case," Health Minister Onyebuchi Chukwu said Thursday in a statement in Abuja, Nigeria's capital, Anadolu news agency reported.
"The 10th case actually was one of the nurses who also had primary contact with the index case. When he (Sawyer) got ill, we then brought her into isolation," the minister told a news conference in Abuja.