Cram\'er-type moderate deviation of normal approximation for unbounded exchangeable pairs

Abstract

In Stein's method, the exchangeable pair approach is commonly used to estimate the approximation errors in normal approximation. In this paper, we establish a Cram\'er-type moderate deviation theorem of normal approximation for unbounded exchangeable pairs. As applications, Cram\'er-type moderate deviation theorems for the sums of local statistics and general Curie--Weiss model are obtained.