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Squared deviations from the mean (SDM) result from squaring deviations. In probability theory and statistics, the definition of variance is either the expected value of the SDM (when considering a theoretical distribution) or its average value (for actual experimental data). Computations for analysis of variance involve the partitioning of a ...
SDM was developed in 1970 by a company known as PANDATA, now part of Cap Gemini, which itself was created as a joint venture by three Dutch companies: AKZO, Nationale Nederlanden and Posterijen, Telegrafie en Telefonie (Nederland). The company was founded in order to develop the method and create training materials to propagate the method.