ssMRCT - Regional Consistency Evaluation and Sample Size Calculation for MRCTs

Calculate conditional regional consistency probabilities and sample sizes for multi-regional clinical trials under fixed-effects and random-effects models. Supports two independent trials, regional fraction selection under symmetric designs, and doubly robust regional treatment-effect estimation. Methods include Qing et al. (2025) <doi:10.1002/sim.70306> and Ren and Xu (2026) <doi:10.1002/pst.70090>.