arXiv:2611.09087v1 Announce Type: new Abstract: We study the group invariance of a parameterized statistical model that is closed under push-forward sample transformations given by a group action. We prove that the group action on the sample space induces an isometric action on the associated statistical manifold. Furthermore, it preserves the Fisher-Rao metric as well as the Amari-Chentsov tensor. Moreover, we establish that this isometric action is compatible with equivariant and sufficient statistics in the spirit of the Hall-Wijsman-Ghosh generalized Stein's theorem. This compatibility leads to a novel reduction of the original group-invariant model, where its Fisher information loss is explicitly quantified via conditional expectation. As an application, we apply this framework to a generalized cardioid distribution in circular data analysis, illustrating how the reduced model facilitates estimation and hypothesis testing for relative parameters.