Fully Exponential Laplace Approximations Using Asymptotic Modes
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Posterior means of positive functions can be expressed as the ratio of integrals which is called fully exponential form. When approximating the posterior means analytically, we usually use Laplace's method. Tierney and Kadane presented a second-order approximation by using the Laplace approximations in each of the numerator and denominator of the fully exponential form. However, Laplace's method requires the exact mode of the integrand. In this article we introduce the concept of asymptotic modes and present the Laplace method via an asymptotic mode under regularity conditions. Furthermore, we propose second-order approximations to the posterior means of positive functions without evaluating the third derivatives of a log-likelihood function and the exact modes of integrands. We also give an Edgeworth-like expansion for the random variable according to a posterior distribution using the Laplace method via an asymptotic mode.