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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 ?
The Receiver Operating Characteristic curve (ROC curve) was applied to derive the best cutoff point in NIHSS and Barthel Index. According to Youden's index, the best cutoff points are NIHSS [greater than or equal to] 9, and Barthel Index [less than or equal to] 17.
Older adults who sat with more of their body segments in neutral alignment would be expected to perform more activities of daily living (physical function), as reflected in the Barthel Index correlation.
Patients with neglect for both regions of space had significantly lower scores on the Barthel Index compared to patients without neglect, U = 328.0, Z = -3.29, P =.001, and higher CBS total scores, U = 373.0, Z = -3.75, P <.001.
score 56) 5.39 0.026 * (mean [+ or -] SD) FRT (in inches) 0.908 0.347 (mean [+ or -] SD) BI (mean [+ or -] SD) 4.14 0.049 * BBS: Berg Balance Scale, FRT: Functional Reach Test, BI: Barthel Index, SD: standard deviation, CI: confidence interval, F: test value for repeated-measures 2-way ANOVA, * significant.
We were able to collect information on pre-stroke levels of disability and function (Barthel index) in almost three-quarters of cases.
The Modified Barthel Index (MBI) was used to measures the ability to complete 10 basic activities of daily living except that the scoring system was modified to be more sensitive by including coding for help required: from 0 (unable) to 5 (independent).
The BPSD was evaluated using the Neuropsychiatric Inventory (NPI), cognitive function was evaluated by the Mini-Mental State Examination (MMSE), the activities of daily living was evaluated by Barthel index (BI) and Disability Assessment for Dementia (DAD), and the extrapyramidal signs were evaluated by United Parkinson's Disease Rating Scale (UPDRS).
We chose the Barthel index to measure FD because of its ability to discriminate between the World Health Organization International Classification of Functioning, Disability and Health (WHO-ICF, 2001) categories in section 2, named "Activity Limitations and Participation Restriction".
The results showed a trend of improvements in National Institute of Health Stroke Scale Score(NIHSS), modified ranking scale (mRS) and modified barthel index at day 0, day 1, day 7 and at follow up at 3 months.