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In this study, different estimators were used for estimating parameter of the exponential distribution, such as maximum likelihood estimator, moment estimator and the Bayes estimator, by assuming six types when the prior distribution for the scale parameter is: Levy distribution, Gumbel type-II distribution, Inverse Chi-square distribution, Inverted Gamma distribution, improper distribution, Non-informative distribution .Under squared and weighted squared error loss functions. We used simulation technique, to compare the performance for each estimator, several cases from Exponential distribution for data generating, for different samples sizes (small, medium, and large). Simulation results shown that The best method is the bayes estimation according to the smallest values of MSE & MWSE for all samples sizes (n) comparative to the estimated values by using Maximum likelihood estimation method (MLE) and Moment estimation method (ME). According to obtained results, we see that when the prior distribution for θ is Inverted Gamma distribution for some values of the parameters β & α , given the best results according to the smallest values of MSE & MWSE comparative to the same values which obtained by using MLE& ME for the assuming true values by 5 . 0 θ  and for all samples sizes. When the prior distribution for θ is Improper distribution for some values of the parameters a & b, given the best results according to the smallest values of MSE & MWSE comparative to the same values which obtained by using MLE & ME for the assuming true values by 1,2,4 θ  and all samples sizes.

mağallaẗ al-ʿulūm al-iqtiṣādiyyaẗ wa-al-idāriyyaẗ

Under Different Priors &amp;Two Loss Functions To Compare Bayes Estimators With Some of Classical Estimators For the Parameter of Exponential Distribution