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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. [1] [2] Indices – also known as indexes and composite indicators – summarize and rank specific observations. [2]
In statistics, economics,and finance, an index is a statistical measure of change in a representative group of individual data points. These data may be derived from any number of sources, including company performance, prices, productivity, and employment.
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.
The Russell indexes are objectively constructed based on transparent rules. The broadest U.S. Russell Index is the Russell 3000E Index which contains the 4,000 largest (by market capitalization) companies incorporated in the U.S., plus (beginning with the 2007 reconstitution) companies incorporated in an offshore financial center that have their headquarters in the U.S.; a so-called "benefits ...
Economic indicators include various indices, earnings reports, and economic summaries: for example, the unemployment rate, quits rate (quit rate in American English), housing starts, consumer price index (a measure for inflation), inverted yield curve, [1] consumer leverage ratio, industrial production, bankruptcies, gross domestic product ...
Composite measure in statistics and research design refer to composite measures of variables, i.e. measurements based on multiple data items. [ 1 ] An example of a composite measure is an IQ test , which gives a single score based on a series of responses to various questions.
Lastly, US services as measured by the Purchasing Managers Index unexpectedly contracted. S&P flash U.S. services PMI dropped to 49.7 in February, well below consensus estimates of 52.9 and below ...
The Atkinson index is defined in reference to a corresponding social welfare function, where mean income multiplied by one minus the Atkinson index gives the welfare equivalent equally distributed income. The index can be turned into a normative measure by imposing a coefficient ε to weight incomes. Greater weight can be placed on changes in a ...