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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 ?
Of the 3,635 new HIV diagnoses in 2008 reported to NYC DOHMH by March 15, 2009, AHI was present in 70 (1.
A Bland-Altman plot (15) of AHI recordings revealed consistent patterns across nights--that is, there was a decrease in indices from night 1 to night 2 (figure).
The AHI was significantly higher in patients with 4+ proteinuria (group 6) as compared with those in all other groups.
NEW JERSEY Cristina Baroni, RMA, AHI, 107 Greenwood Ave.
Although government hospitals and the AHI have a standing agreement on patient referrals, the Mail understands that the deal has fallen by the wayside ostensibly because of disagreements on price.
If an in-lab AHI of 10/hr or more is the gold standard, an in-home AHI threshold of 10/hr would yield a sensitivity of 0.
A total of 50 patients were classified as having mild to moderate sleep apnea, defined as an AHI of between 5 and 30, while the remaining 53 patients had severe disease, with an AHI of more than 30, reported Dr.
With recent additions of 40,000 square feet for manufacturing and 10,000 square feet for built-in demonstrations and assembly overflow, AHI plans to transfer production from its Wisconsin Division to its Corporate Headquarters while implementing a phased closure of its Oshkosh, WI site.
AHI Carrier is joint venture formed in 2008 between Carrier and AHI, part of the UAE-located Darwish Bin Ahmed Group.
The results revealed that 94 percent of subjects with Down syndrome had OSA, 88 percent had at least moderate OSA with an apnea-hypopnea index (AHI) of more than 15 breathing pauses per hour of sleep, and 69 percent had severe OSA with an AHI of more than 30.