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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 ?
9% reduction of modified gingival index (MGI) respectively with statistically significant difference at (P <0.
The same happens with gingival index, which was evaluated in three of the four studies, but only Booth et al (37) found statistically significant differences in the maxillary lingual surfaces, while Pandis (34) and Cerny (35) found no differences.
The association of gingival index to the level of education in Table 1 shows no significant relationship (p-value 0.
This study was conducted to compare the values of salivary pH, salivary flow rate, gingival index (GI), and dental caries in the 1st, 2nd, and 3rd visits of asthmatic and non-asthmatic children after providing education on oral hygiene and applying preventive measures and to investigate the effect of the education provided initially about oral and dental health on dental caries.
J Mash Dent Sch 2010; 34 (2): 125-134 Variables Article title analyzed Results A clinical and Oral hygiene Coronal marginal radiographic index adaptation and the level evaluation of of oral hygiene showed a stainless Steel significant effect on crowns for primary gingival index molars.
8 5 PI = plaque index, GI = gingival index, BOP = bleeding on probing, MPD = mean pocket depth, MP=maximum pocket detected Table 2.
Bleeding on probing was measured on a 0 to 3 severity scale following the Loe-Silness gingival index.
Information gathered during the examination included a gingival index, a plaque score, periodontal probing depths, gingival recession and bleeding on probing.
A specific questionnaire regarding natural teeth in contact with removable partial denture and not in contact with removable partial denture is based on the following parameters; gingival index (GI) (Loe and Silness, 1963)8,19, plaque index (PI) (Loe and Silness, 1964) and calculus index (CI)( Greene and Vermilion, 1960).
The following measurements were taken on each maxillary and mandibular anterior tooth: Plaque Index (PI) by Silness and Loe 1964 and Gingival Index (GI) by Loe and Silness 1963.