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  2. Frequency (statistics) - Wikipedia

    en.wikipedia.org/wiki/Frequency_(statistics)

    A frequency distribution shows a summarized grouping of data divided into mutually exclusive classes and the number of occurrences in a class. It is a way of showing unorganized data notably to show results of an election, income of people for a certain region, sales of a product within a certain period, student loan amounts of graduates, etc.

  3. Pivot table - Wikipedia

    en.wikipedia.org/wiki/Pivot_table

    Excel pivot tables include the feature to directly query an online analytical processing (OLAP) server for retrieving data instead of getting the data from an Excel spreadsheet. On this configuration, a pivot table is a simple client of an OLAP server.

  4. Letter frequency - Wikipedia

    en.wikipedia.org/wiki/Letter_frequency

    The California Job Case was a compartmentalized box for printing in the 19th century, sizes corresponding to the commonality of letters. The frequency of letters in text has been studied for use in cryptanalysis, and frequency analysis in particular, dating back to the Arab mathematician al-Kindi (c. AD 801–873 ), who formally developed the method (the ciphers breakable by this technique go ...

  5. Spreadsheet - Wikipedia

    en.wikipedia.org/wiki/Spreadsheet

    Formulas in the B column multiply values from the A column using relative references, and the formula in B4 uses the SUM() function to find the sum of values in the B1:B3 range. A formula identifies the calculation needed to place the result in the cell it is contained within. A cell containing a formula, therefore, has two display components ...

  6. List of Formula One driver records - Wikipedia

    en.wikipedia.org/wiki/List_of_Formula_One_driver...

    The World Championship of Drivers has been held since 1950.Driver records listed here include all rounds which formed part of the World Championship since 1950: this includes the Indianapolis 500 from 1950–1960 (although it was not run to Formula One rules), and the 1952 and 1953 World Championship Grands Prix (which were run to Formula Two rules).

  7. List of equations - Wikipedia

    en.wikipedia.org/wiki/List_of_equations

    Kirchhoff's diffraction formula; Klein–Gordon equation; Korteweg–de Vries equation; Landau–Lifshitz–Gilbert equation; Lane–Emden equation; Langevin equation; Levy–Mises equations; Lindblad equation; Lorentz equation; Maxwell's equations; Maxwell's relations; Newton's laws of motion; Navier–Stokes equations; Reynolds-averaged ...

  8. Relative species abundance - Wikipedia

    en.wikipedia.org/wiki/Relative_species_abundance

    The number of species missing from the data set (the missing area to the left of the veil line) is simply N minus the number of species sampled. [2] Preston did this for two lepidopteran data sets, predicting that, even after 22 years of collection, only 72% and 88% of the species present had been sampled.

  9. Reverse lookup - Wikipedia

    en.wikipedia.org/wiki/Reverse_lookup

    Reverse lookup is a procedure of using a value to retrieve a unique key in an associative array. [1]Applications of reverse lookup include reverse DNS lookup, which provides the domain name associated with a particular IP address, [2]