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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 ?
Major Finding: For women who were given medroxyprogesterone, the mean Ki-67 labeling index decreased from 51.
We undertook this study to (1) confirm prior studies of differentially expressed cytokeratins in ITACs and non-ITACs, especially in comparison to the profiles seen in benign glandular lesions; (2) define the immunophenotypic characteristics of basal/myoepithelial cells found in sinonasal mucosa and examine benign and malignant lesions of sinonasal mucosa using antibodies targeted at basal and myoepithelial lineage; and (3) compare proliferation rates and proliferative cellular compartments among sinonasal lesions using a Ki-67 labeling index (KLI).
To determine the labeling index (proportion of proliferating cells), digital images of the tissues were taken and analyzed using a computerized image analysis program.
Although recent advances in molecular neuro-oncology are promising for the emergence of new prognostic markers and chemotherapeutic targets, the only widely used and consistently reliable molecular markers of CNS tumor behavior are Ki-67 labeling index in general and 1p/19q loss of heterozygosity (LOH) specifically in oligodendrogliomas.
For a variety of human tumors, including bladder carcinomas, the Ki-67 labeling index has been shown to be of prognostic value for tumor recurrence and for patient survival (2-4).
Rapid clearance from serum, high labeling index and absence of tissue specificity make Penetratin peptides efficient vehicles for systemic delivery of therapeutics interacting with drug targets in the cellular cytosol and nucleus.
Examples of topics covered include the plasma cell labeling index, multicolor spectral karyotyping, detection of chromosome 13 deletions by fluorescent in situ hybridization, identification and of clonotypic IgH VDJ sequences, real-time polymerase chain reaction of immunoglobulin rearrangements for quantitative evaluation of minimal residual disease, determination of telomerase activity and telomere length, clonality detection of the expanded t-cell populations in patients with multiple myeloma, and use of DNA micrrarray data.
In contrast to these tumors, the neoplasm described in this report does not have histologic features suggestive of a high-grade malignant neoplasm, such as increased mitotic activity, necrosis, prominent vascular proliferation, or high MIB-1 labeling index.