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  2. Order (group theory) - Wikipedia

    en.wikipedia.org/wiki/Order_(group_theory)

    The order of an element of a group (also called period length or period) is the order of the subgroup generated by the element. If the group operation is denoted as a multiplication , the order of an element a of a group, is thus the smallest positive integer m such that a m = e , where e denotes the identity element of the group, and a m ...

  3. Spreadsheet - Wikipedia

    en.wikipedia.org/wiki/Spreadsheet

    Use of named column variables x & y in Microsoft Excel. Formula for y=x 2 resembles Fortran, and Name Manager shows the definitions of x & y. In most implementations, a cell, or group of cells in a column or row, can be "named" enabling the user to refer to those cells by a name rather than by a grid reference.

  4. Elementary arithmetic - Wikipedia

    en.wikipedia.org/wiki/Elementary_arithmetic

    Subtraction evaluates the difference between two numbers, where the minuend is the number being subtracted from, and the subtrahend is the number being subtracted. It is represented using the minus sign ( − {\displaystyle -} ).

  5. Cognitive categorization - Wikipedia

    en.wikipedia.org/wiki/Cognitive_categorization

    Categorization is a type of cognition involving conceptual differentiation between characteristics of conscious experience, such as objects, events, or ideas.It involves the abstraction and differentiation of aspects of experience by sorting and distinguishing between groupings, through classification or typification [1] [2] on the basis of traits, features, similarities or other criteria that ...

  6. Difference in differences - Wikipedia

    en.wikipedia.org/wiki/Difference_in_differences

    Difference in differences (DID [1] or DD [2]) is a statistical technique used in econometrics and quantitative research in the social sciences that attempts to mimic an experimental research design using observational study data, by studying the differential effect of a treatment on a 'treatment group' versus a 'control group' in a natural experiment. [3]

  7. Phone companies haven't notified most victims of Chinese data ...

    www.aol.com/news/most-victims-chinese-phone-data...

    Phone companies maintain records like which phone numbers participated in calls and when those calls happened and potentially the locations of the cell towers their phones connected to.

  8. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    Subtraction is the inverse of addition. In it, one number, known as the subtrahend, is taken away from another, known as the minuend. The result of this operation is called the difference. The symbol of subtraction is . [47] Examples are = and =. Subtraction is often treated as a special case of addition: instead of subtracting a positive ...

  9. Seasonality - Wikipedia

    en.wikipedia.org/wiki/Seasonality

    The box plot shows the seasonal difference (between group patterns) quite well, but it does not show within group patterns. However, for large data sets, the box plot is usually easier to read than the seasonal subseries plot. The seasonal plot, seasonal subseries plot, and the box plot all assume that the seasonal periods are known.