Choosing an Appropriate Estimator (2)• In many cases, a parameter may be estimated bymore than one estimator. How then do we decidewhich estimator to use for estimating a givenparameter?• The decision is based on an objective measure orset of criteria that reflect some desired property ofa particular estimator.• When measured against these criteria, someestimators are better than others. One of thesecriteria is the property of unbiasedness.