This paper is intended to compare between the Bayesian estimates of hazard rate and
the hazard rates of mixed distributions. In estimating hazard rates, especially when
the MLE method is used, such difficulties as a lack of data and the existence of
censored data make it difficult to estimate the rates. For this reason,
the estimates of hazard rate based on the Bayesian approach are introduced.
For the simplicity, the exponential and gamma distributions are adopted as
a sampling distribution and its natural conjugate prior distribution, respectively.