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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 ?
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.
The rat kidney carcinogens DCB, MON, and LIM increased the labeling index in male rat kidney, although the time courses were different (Figure 3).
In the 2010 WHO classification scheme, NECs are defined as poorly differentiated tumors with a mitotic rate of more than 20 per 10 HPFs and/or a greater than 20% Ki-67 labeling index.
Despite the shortcomings in determining the Ki67 labeling index on FNA material, we went ahead and compared the grading of the resections with that of FNA material in the 16 cases on which this was feasible (Table 1).
Coumestrol exposure led to a significant increase in the labeling index of the uterine epithelium and the glands and stroma of the endometrium in all three groups of females (Table 3, Figure 3).
Interobserver reproducibility of MIB-1 labeling index in astrocytic tumors using different counting methods.
The Ki-67 labeling index of tanycytic ependymoma was lower than other subtypes of ependymoma, which indicated that tanycytic ependymoma has a better prognosis.
However, before synoptic reporting can be effectively adapted to CNS tumors, standard methods for determining Ki-67 labeling index and mitotic count--and in some cases, even morphologic features, for example, mixed oligoastrocytoma cytology--need to be firmly established.
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).
At least 1000 tumor cells were examined for each case, and the percentage of positively stained nuclei was calculated as the labeling index.
However, the cutoff points for MIB-1 counts are broadly scattered, and universally applicable labeling index (LI) thresholds for oligodendroglioma prognosis are not yet a reality.