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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 ...
1 1 Fertiliser × Environment 556.1667 6 1 −1 Fertiliser 525.4 3 1 −1 Environment 519.2679 2 1 −1 Composite (correction factor [8]) 504.6 1 −1 −1 −1 1 Squared deviations () 136.4 14.668 20.8 16.099 84.833 Degrees of freedom 14 1 2 2 9 Mean square variance 14.668 10.4 8.0495 9.426
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.