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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.
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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.
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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.
Wall Street Words: An A to Z Guide to Investment Terms for Today's Investor by David L. Scott. Copyright © 2003 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. All rights reserved.


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.

Dictionary of Financial Terms. Copyright © 2008 Lightbulb Press, Inc. All Rights Reserved.


(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

The Complete Real Estate Encyclopedia by Denise L. Evans, JD & O. William Evans, JD. Copyright © 2007 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
We also showed a significant inverse correlation between the oxygenation index and LDH (P = 0.008, [R.sup.2] = 0.258).
Furthermore, IL-6/IL-10 had the highest AUC and correlated inversely with the oxygenation index (P < 0.001, [R.sup.2] = 0.276).
The parameters in CPIS such as WBC, temperature, and oxygenation index also showed obvious improvements, demonstrating that the addition of AA facilitated the infection control of VAP.
Dynamic lung compliance (Cdyn) and oxygenation index (Pa[O.sub.2]-Fi[O.sub.2]) of male pigs induced with acute respiratory distress syndrome that received continuous veno-venous hemofiltration therapy (experimental) or conventional supportive therapy (control).
* The breakpoints (Bp) of muscle oxygenation index in both vastus lateralis (VL) and gastrocnemius lateralis (GL) could be detected to indicate the breaking up of the oxygen supply-consumption balance by NIRS.
* The Bp of muscle oxygenation index in both VL (BpVL) and GL (BpGL) were significantly correlated with the systemic aerobic capacity indices.
Table 1 Patient characteristics Number of patients 36 Age 68.4 [+ or -] 12.8 Gender, M:F 10:26 APACHE II score 26.4 [+ or -] 7.1 SOFA score 9.4 [+ or -] 3.2 Diagnosis (%) Exacerbation of IP 14 (39) Pneumonia 11 (31) Aspiration pneumonia 3 (8) Other 8 (22) [P.sub.a][O.sub.2]/Fi[O.sub.2] at start of 157.6 [+ or -] 114.5 CMV [P.sub.a][O.sub.2]/Fi[O.sub.2] at start of 99.5 [+ or -] 50.0 HFOV Oxygenation index at start of CMV * 16.4 [+ or -] 8.8 Oxygenation index at start of HFOV * 23.6 [+ or -] 15.8 CMV time prior to HFOV, h 9.3 (4.8 to 25) M=male, F=female, APACHE=Acute Physiology and Chronic Health Evaluation, SOFA=Sequential Organ Failure Assessment, IP=interstitial pneumonia, CMV=conventional controlled mechanical ventilation, HFOV=high/frequency oscillatory ventilation.
In addition, pulmonary X-ray, arterial oxygen partial pressure (PaO2), oxyhemoglobin saturation, carbon dioxide partial pressure (PaCO2), oxygenation index (OI), and ratio of arterial/pulmonary oxygen partial pressures (a/AO2) were also compared.
Results: After treatment, the level of PaO of both groups significantly improved, and respiratory function indexes such as partial pressure of carbon dioxide in artery (PaCO ), oxygenation index (OI), fraction of inspiration O (FiO ) and mean arterial pressure (MAP) decreased (P<0.05); the improvement of various indexes of the research group was more obvious than that of the control group (P0.05), but the clinical outcome of the research group was better than that of the control group.
Observation index: Respiratory functional indexes such as oxygenation index (OI), Fraction of inspiration O2 (FiO2) and MAP and arterial blood gas indexes such as PaO2 and partial pressure of carbon dioxide in artery (PaCO2) were observed before treatment (T0), three hours after treatment (T1), 6 hours after treatment (T2), and 24 hours after treatment (T3).