01276naa a2200181 a 450000100080000000500110000800800410001910000200006024500620008026000090014230000100015150000120016152007430017370000200091670000230093670000210095977301140098010038212007-08-07       1996    bl uuuu     u00u1 u    #d1 aCORDEIRO, G. M.  aBias-correction for the beta maximum likelhood estimates.  c1996  ap.126  aResumo.  aThe purpose of this paper is to find closed-form expressions for bias-corrected maximum likelihood estimates of the parameters of the beta distributions so that the corrected estimates are almost umbiased and computationally feasible for routine use. Some simple approximations based on asymptotic expansions for the bias corrections are given. We present simulation results to compare the performance of the maximum likelihood estimates and corrected one for a large number of combinations of the two index parameters of the beta distribution. These indicate, over a limited parameter space, that bias-corrected estimates are much better than standard maximum likelihood estimates, and furthermore the differences are often considerable.1 aROCHA, E. C. da1 aROCHA, J. G. C. da1 aCRIBARI-NETO, F.  tIn: SIMPÓSIO NACIONAL DE PROBABILIDADE E ESTATÍSTICA, 12., 1996, Caxambu. Resumos... São Paulo: ABE, 1996.