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Mention the conditions to be followed in the method of least squares. /Principles of Method of least squares.

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The sum of the deviations obtained from the actual and trend values is Zero ie. Σ(Y – Ȳ)= 0 and The sum of the squares of the deviations obtained from the actual and trend values is least. i.e., Σ(Y – Ȳ)2 is least.

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