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Index

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.

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.

index

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.

index

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.

Index.

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.

index

(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 ?
These results lead us to suspect that this supplement certainly has antimicrobial effect, since the gingival bleeding index and Silness and Loe index were lower even in the presence of more dental plaque, so the nature of the plaque must be modified, possibly because of a change in the pH or by a different bacterial composition.
The clinical indices used were Pocket depth (PD), Bleeding Index (BI), Mobility (MI).
The data was analyzed and arranged to see the influence of oral hygiene index, gingival bleeding index and glycaemic control on severity of periodontitis and glycaemic status and it was compared with same oral hygiene status individuals by removing the confounding factor of oral hygiene.
With respect to Quigley-Hein, Sulcus Bleeding Indexes and stress level, means, and standard deviations were calculated.
PYCNOGENOL[R] chewing gums significantly reduced gingival bleeding, while no changes were noted in bleeding indexes in control subjects who used regular chewing gums.
* The sulcular bleeding index score was reduced by 53% at day 30, and by 51% at day 60.
Plaque index (PI), Calculus index (CI), Gingival index (GI), Clinical attachment level (CAL), Papillary bleeding index (PBI) of each subject was performed by a single investigator.
At the three- and six-month visits, the Modified Gingival Index (MGI), Turesky Modification of the Quigley-Hein Plaque Index (PI) and the Bleeding Index (BI) were scored and oral tissue examinations performed.
The objective of this work was to clinically evaluate the clinical parameters, plaque index and gingival bleeding index; the gingival thickness in smokers and non-smokers.
However, in agreement with the results of this study, no association between the periodontal parameters (Gingival Bleeding Index and Plaque Index) and the laboratory data was observed.
Scaling and root planing used in combination with PDT has proven to decrease the bleeding index (9), (10) and the number of p.