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Two aspects of prior specification are also studied : an argument is made for the use of a Poi ( 1 ) distribution as the prior for k ; and methods are given for the selection of hyperparameter values in the mixture of normals model , with natural conjugate priors on the components parameters . Financial measures falling in the bull 's eye are strong points , and should be maintained . If you look just at the experienced groups of cardiac surgeons and their hospitals , the results were still remarkably variable : there was a five-hundred-per-cent difference in the mortality rates for cardiac surgery among experienced hospitals . Within a loaded HMA layer , the strain in the aggregate particles or in the asphalt mastic is not the same as the average strain in the layer .