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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 ?
For the handheld release things are slightly different, because you aren't using your index finger to fire the shot.
If we can restore the ability to pinch, between thumb and index finger, it can return some very basic independence.
In women, a longer index finger has been linked to a higher risk of breast cancer - as well as greater fertility.
By dividing the length of the index finger by that of the ring finger, researchers at the university were able to work out a ratio by which relative finger lengths could be compared.
But the risk for those whose index fingers were longer than their ring fingers was reduced by 33%.
Reports of the X- rays and tests performed at this hospital showed the index finger was broken while the bones of the finger which was in plaster had been abnormally joined," said Mandal.
I put my hand in his hand and I noticed his right index finger was black at the end," said Nicola.
The researchers measured the lengths of the youngsters' fingers on both hands, then divided the length of the index finger by that of the ring finger to calculate their digit ratios.
The Premium Keyboard features fifteen large finger typing keys: three rows of on-screen keys, each row with five large finger keys for typing with your index finger or thumbing.
I'm so amazed,'' Pat Rivas, 55, of Moorpark, said after sitting next to a bronze statue of Albert Einstein holding his right index finger in front of his eyes and facing The Big Picture.
The Statue of Liberty's index finger is (a) -- feet long.
When I tested the theory on a fit colleague of mine, we discovered her ring finger was slightly shorter than her index finger.