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Highest Posterior Density Intervals As Analogues to Profile Likelihood Ratio Confidence Intervals for Modes of Unimodal Distributions
A. X. Venu
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In Bayesian statistics, the highest posterior density (HPD) interval is often used to describe properties of a posterior distribution. As a method for estimating confidence intervals (CIs), the HPD has two main desirable properties. Firstly, it is the shortest interval to have a specified coverage probability. Secondly, every point inside the HPD interval has a density greater than every point outside the interval. However, the HPD interval is sometimes criticized for being transformation invariant. We make the case that under certain conditions the HPD interval is a natural analog to the frequentist profile likelihood ratio confidence interval (LRCI). Our main result is to derive a proof showing that under specified conditions, the HPD interval with respect to the density mode is transformation invariant for monotonic functions in a manner which is similar to a profile LRCI.
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