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The inverted index is a sparse matrix, since not all words are present in each document. To reduce computer storage memory requirements, it is stored differently from a two dimensional array. The index is similar to the term document matrices employed by latent semantic analysis. The inverted index can be considered a form of a hash table.
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]
Fidelity Municipal Bond Index Fund (FMBIX) – This fund invests at least 80 percent of its assets in securities included in the Bloomberg Municipal Bond Index and seeks to provide a high level of ...
Web indexing, or Internet indexing, comprises methods for indexing the contents of a website or of the Internet as a whole. Individual websites or intranets may use a back-of-the-book index, while search engines usually use keywords and metadata to provide a more useful vocabulary for Internet or onsite searching.
Low costs: Index funds are a great, low-cost way to invest. In 2022, the asset-weighted average expense ratio on stock index mutual funds was just 0.05 percent — a bargain price that is tough to ...
A bitmap index is a special kind of indexing that stores the bulk of its data as bit arrays (bitmaps) and answers most queries by performing bitwise logical operations on these bitmaps. The most commonly used indexes, such as B+ trees, are most efficient if the values they index do not repeat or repeat a small number of times. In contrast, the ...
The index slowly retreated for the remainder of the week and into the next week, before coronavirus fears and an oil price war between Saudi Arabia and Russia sent the index into a tailspin, recording several days of losses [74] (and gains [75]) of at least 1,000 points, a typical symptom of a bear market [76] as previously seen in October 2008 ...