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What do you mean by method of least squares?

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In this method a mathematical relation is developed between the time (x) and the values (y). The relation may be used to fit (a) Linear/straight line trend (6) Quadratic trend (c) Exponential trend. Such that “the sum of the squares of the deviations obtained from actual and trend vales is least”. And these relations are used for computing the trend values in the time series.

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