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Related to refractive index: Total internal reflection, refractometer


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 ?
This plot will later be related to the refractive index differences between the various trials.
The normalized frequency of PCF has connection with the input frequency, radius of the air holes, core effective refractive index and the cladding effective refractive index.
A design of experiment was developed and executed in three phases: Phase 1: Rosin load analysis, to evaluate the impact of rosin on concentration monitoring techniques, including the novel sensor and refractive index.
The main drawbacks of the material are its low refractive index and low tensile strength.
The refractive index of water differs sufficiently from that of common bead material to enable accurate calibration of the count of the aqueous suspension against commercial PSL count standards.
The mass of the three-dimensional Ti-O-Ti bonds has high refractive index and poor solubility to the system.
Since the refractive index is a fundamental physical property of a substance, it is often used to identify a particular substance, to confirm its purity or to measure its concentration.
Zilkowski [5] proposed one class of metamaterial as zero refractive index metamaterial.
The development of a new procedure had become necessary in order to manufacture GRIN-optics, which have a refractive index gradient over the whole material surface.
The shampoos and conditioners help remove dulling deposits and sebum; reduce cuticle damage caused by heated styling, combing and chemicals; reduce internal damage by using moisturising rice protein, white tea and UV inhibitors; apply a film with high refractive index and 3D shine boosting ingredients and enhance the hair alignment through conditioning and styling formulas.
The refractive index of the adhesive, measured in the oriented direction nMD is greater than the refractive index measured in a direction perpendicular to the oriented direction nCD.
It said the ceramic lens has a higher refractive index than glass lens.