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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 ?
Validation of the Spanish Addiction Severity Index Multimedia Version (S-ASI-MV).
i) Severity of alcohol dependence syndrome--The severity of alcohol dependence syndrome was assessed using the Addiction Severity Index (ASI) (23).
Abbreviations: ANOVA = analysis of variance, ASI = Addiction Severity Index, BPI = Brief Pain Inventory, CAPS = Clinician-Administered Posttraumatic Stress Disorder Scale, DSM-IV = Diagnostic and Statistical Manual of Mental Disorders-Fourth Edition, HSD = honest significant difference, M.
The Addiction Severity Index (ASI) is the most widely used instrument in addiction treatment.
There were no significant differences between these respondents and the total sample on demographics, baseline Addiction Severity Index (ASI) (McLellan, Luborsky, Woody, & O'Brien, 1980) composite scores, or number of hospital days.
Para medir la severidad del consumo de sustancias se utilizo el instrumento Addiction Severity Index (ASI-Lite) que tiene 22 preguntas con distintas escalas de respuestas que indagan sobre el uso de alcohol y drogas en la vida, en los ultimos 90 dias y problemas asociados al consumo.
The investigators compared demographics, clinical characteristics, and treatment outcomes for 166 adults receiving primary care--based buprenorphine/naloxone treatment, stratifying by history of incarceration as determined by the legal domain of the Addiction Severity Index.
The aforementioned article in The Brown University Child and Adolescent Psychopharmacology Update cites several helpful diagnostic instruments and scales, such as the school-age children's version of the Schedule for Affective Disorders and Schizophrenia (K-SADS), the Addiction Severity Index (ASI) and the Child Behavior Checklist (CBCL).
For example, Meyers and colleagues (1995) developed the Comprehensive Addiction Severity Index for Adolescents (CASI-A), which is a 45- to 90-minute comprehensive, semi-structured clinical interview for evaluating adolescents who present for treatment at various provider agencies.
To assess substance problem severity at admission and follow-up, we used an abbreviated form of the Addiction Severity Index (ASI).

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