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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 ?
0 mmol/l, or standard therapy where the PAC was used to measure and optimise filling pressures and cardiac index.
Patient data were recorded hourly and included heart rate, blood pressure, central venous pressure, PAOP, cardiac index (CI), D[O.
By combining BNP with CardioDynamics' noninvasive cardiac index measurement, a quicker and more accurate diagnosis of the type of CHF can be made, and the treating physician can more precisely direct treatment at the underlying pathophysiology.
The blood samples were also repeated after a significant change in cardiac index ([greater than or equal to]10%) from the baseline and occurred within 24 hours of study enrolment while the patient was ventilated with the same baseline inspired oxygen concentration.
Recently we have shown that urinary nitrite and nitrate (NOx) excretion in patients after cardiovascular surgery positively correlated with the cardiac index (CI), but negatively with the systemic vascular resistance index (SVRI) (9).
Although, additional studies are needed, and some, in fact, are already proceeding, the significant increases in stroke volume, cardiac output and cardiac index that were noted in these patients suggest that EECP may favorably impact contractility.
Levosimendan increases the cardiac index and decreases the systemic vascular resistance; its use has been predominantly confined to the patients with cardiac failure.
In a previous double-blind, placebo controlled, pilot Phase II clinical study in 19 patients with NYHA Class II or III CHF, DITPA demonstrated a significant increase in cardiac index, as well as improvements in diastolic function, systemic vascular resistance and cholesterol and triglyceride levels.
In the RITZ-2 trial, Veletri demonstrated statistically significant hemodynamic (blood circulation) benefits in its primary efficacy measure, improvement in cardiac index (CI, the amount of blood pumped by the heart per minute/body surface area).
In the study, the company's BioZ System was selected as the reference measurement device to monitor changes in stroke volume (the amount of blood pumped by the left ventricle each heart beat) and cardiac index (the amount of blood pumped by the heart each minute) at various right ventricular pacing settings in patients with chronic atrial fibrillation.
Fluids and inotropic support (dobutamine and noradrenaline) resulted in cardiac index (CI) 2.