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Sample of a well maintained data [clarification needed]. In statistics and research design, an index is a composite statistic – a measure of changes in a representative group of individual data points, or in other words, a compound measure that aggregates multiple indicators.
Some indices display market variations. [definition needed] For example, the Economist provides a Big Mac Index that expresses the adjusted cost of a globally ubiquitous Big Mac as a percentage over or under the cost of a Big Mac in the U.S. in USD. [4] Such indices can be used to help forecast currency values. [citation needed]
Stock market indices may be categorized by their index weight methodology, or the rules on how stocks are allocated in the index, independent of its stock coverage. For example, the S&P 500 and the S&P 500 Equal Weight each cover the same group of stocks, but the S&P 500 is weighted by market capitalization, while the S&P 500 Equal Weight places equal weight on each constituent.
Price indices are represented as index numbers, number values that indicate relative change but not absolute values (i.e. one price index value can be compared to another or a base, but the number alone has no meaning). Price indices generally select a base year and make that index value equal to 100.
Dental indices, standardized scoring systems for tooth problems; Indexicality, in linguistics, the phenomenon of a sign pointing to some object in the context in which it occurs; Indexing (motion), in mechanical engineering and machining, movement to a precisely known location; Refractive index, a measurement of how light propagates through a ...
First calculated on May 26, 1896, [2] the index is the second-oldest among U.S. market indices, after the Dow Jones Transportation Average. It was created by Charles Dow, co-founder of both The Wall Street Journal and Dow Jones & Company, and named after him and his business associate, statistician Edward Jones.
A CPI is a statistical estimate constructed using the prices of a sample of representative items whose prices are collected periodically. Sub-indices and sub-sub-indices can be computed for different categories and sub-categories of goods and services, which are combined to produce the overall index with weights reflecting their shares in the total of the consumer expenditures covered by the ...
The Nasdaq Composite (ticker symbol ^IXIC) [2] is a stock market index that includes almost all stocks listed on the Nasdaq stock exchange.Along with the Dow Jones Industrial Average and S&P 500, it is one of the three most-followed stock market indices in the United States.