Statistical stability for systems semi-conjugate to pre-piecewise convex or expanding maps with countably many branches

We investigate the statistical stability of a class of dynamical systems that are semi-conjugate to pre-piecewise convex or expanding maps with countably many branches. These systems may exhibit complex features such as unbounded derivatives, discontinuities, or infinite Markov partitions, which pose significant challenges for stability analysis. Considering one-parameter families of transformations $\{F_δ\}_{δ\in [0,1)}$ with corresponding invariant measures $\{μ_δ\}_{δ\in [0,1)}$, we provide conditions ensuring that $μ_0$ is statistically stable, i.e., that the map $δ\mapsto μ_δ$ is continuous at $δ= 0$ in an appropriate topology. Moreover, we establish explicit quantitative estimates for the modulus of continuity of $μ_δ$ in terms of the perturbation parameter $δ$.