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

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

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