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Index numbers are used especially to compare business activity, the cost of living, and employment. They enable economists to reduce unwieldy business data into easily understood terms. In contrast to a cost-of-living index based on the true but unknown utility function, a superlative index number is an index number that can be calculated. [1]
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]
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.
A price index (plural: "price indices" or "price indexes") is a normalized average (typically a weighted average) of price relatives for a given class of goods or services in a given region, during a given interval of time.
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 ...
It is one of the most commonly followed equity indices and includes approximately 80% of the total market capitalization of U.S. public companies, with an aggregate market cap of more than $43 trillion as of January 2024. [2] [6] The S&P 500 index is a free-float weighted/capitalization-weighted index.
A diversity index is a method of measuring how many different types (e.g. species) there are in a dataset (e.g. a community).Some more sophisticated indices also account for the phylogenetic relatedness among the types. [1]
Index funds that attempt to track the Nasdaq Composite include Fidelity Investments' FNCMX mutual fund [4] and ONEQ [5] [6] exchange-traded fund. Invesco offers the Nasdaq: QQQ exchange-traded fund, which matches the performance of the Nasdaq-100, a different index which tracks 100 of the largest non-financial companies in the Nasdaq Composite and is 90% correlated with the Nasdaq Composite.