Estimation

From Freepedia

Estimation is generally the calculation of an approximate or uncertain result, often based on approximate, uncertain, incomplete, or noisy data.

For an account of statistical estimation, see estimator and estimation theory.

In mathematics, estimation often means the finding of upper or lower bounds on a quantity that cannot readily be computed precisely.

It is true that "Estimation is approximate or uncertain calculation of a result, often based on approximate, uncertain, incomplete, or noisy inputs. "But in due course of time the inputs characteristics like approximate, uncertain , incomplete, noisy are purified to become accurate, certain, complete and noise-free inputs. It is a continuous activity and not one time.