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  2. Spreadsheet - Wikipedia

    en.wikipedia.org/wiki/Spreadsheet

    The key feature of spreadsheets is the ability for a formula to refer to the contents of other cells, which may, in turn, be the result of a formula. To make such a formula, one replaces a number with a cell reference. For instance, the formula =5*C10 would produce the

  3. Item response theory - Wikipedia

    en.wikipedia.org/wiki/Item_response_theory

    IRT is based on the idea that the probability of a correct/keyed response to an item is a mathematical function of person and item parameters. (The expression "a mathematical function of person and item parameters" is analogous to Lewin's equation, B = f(P, E), which asserts that behavior is a function of the person in their environment.) The ...