Least-squares method

noun, Statistics.
a method of estimating values from a set of observations by minimizing the sum of the squares of the differences between the observations and the values to be found.
a method for determining the best value of an unknown quantity relating one or more sets of observations or measurements, esp to find a curve that best fits a set of data. It states that the sum of the squares of the deviations of the experimentally determined value from its optimum value should be a minimum


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