Semiparametric Ecological Inference // Efficient and user- friendly routines for modern ecological inference. Implements the methods described in McCartan Kuriwaki (2025+) doi:10.48550/arXiv.2509.20194, which generalize ecological regression as introduced by Goodman (1953) doi:10.2307/2088121. Includes routines for preprocessing, synthetic data generation, double/debiased machine learning (DML) estimation, partial identification bounds, and sensitivity analysis.