Estimation

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

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

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

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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.

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Estimator: In statistics, an estimator is a function of the known sample data that is used to estimate an unknown population parameter; an estimate is the result from the actual application of the function to a particular set of data. Many different estimators are possible for any given parameter. Some criteri...

Estimation theory: Estimation theory is a branch of statistics and signal processing that deals with estimating the values of parameters based on measured/empirical data. The parameters describe the physical scenario or object that answers a question posed by the estimator....