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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 ?
High mitotic index ([greater than or equal to]10/10 HPF) and high Ki-67 PI (>10%) can be useful indicators for diagnosing LMS, distinguishing benign tumors, and predicting an aggressive clinical course.
2015) investigated toxicity at cellular level of flavorings of chocolate, strawberry and condensed milk using root meristem cells of A cepa, and reported that these three substances, in the same way as the aroma and flavor additives studied herein, were cytotoxic to root meristems, as they caused significant reduction of the mitotic index of the cells of the tissues analyzed.
The aim of this study was to evaluate the effects of five newly synthesized 4-thiazolidinone derivatives on HeLa cell line (CCL2) originated from human cervical carcinoma by comparing the parameters of cell kinetic, labeling index and mitotic index.
Heptaplatin induced ramifications on the mitotic index of bone morrow cells of SWR/J mice after 24, 48 and 72 h of administration.
The cell mitotic index were examined and counted microscopically on squashes.
Similarly the reduction of mitotic index was also found in all quercetin pretreated groups, except 5 [micro]g/mL.
1996) documented a disproportionately high mitotic index of expelled S.
14) Vukovic and Sofradzija (1989) examining the genotoxic action of Lorsilan, Librium, a Mepbromat and Apaurin came to the conclusion that the first three have similar effects, and is manifested by lowering the mitotic index, the advent of C-mitosis, abnormal metaphases and anaphases and polyploidy.
Relatively well known prognostic factors included stage, tumor size, lymphovascular space invasion (LVSI), mitotic index, and nuclear atypia.
The pathologic features of this tumor have been described as large cells with abundant cytoplasm arranged in organoid, nested, trabecular, rosette-like or palisading patterns, low nuclear-cytoplasm ratio, a mitotic index greater than 10/10 per high power fields or a mitotic rate higher than 11 mitotic figures/2 [mm.
PHH3 stains only cells in mitosis, offering the possibility of obtaining true mitotic index.
The grade of GIST can vary and is assessed using the mitotic index from histology (1).