1[2 {"id":"C1","text":"In 2023 (the most recent year with >=150 countries having both indicators), life expectancy is positively associated with ln GDP per capita across 197 countries; slope 5.27 years per log-point, HC3 95% CI [4.85, 5.68].","results_keys":["analysis_year","n_analysed","effect_estimate","effect_se","effect_ci_low","effect_ci_high","conclusion"],"status":"supported","caveat":"Associational only; CI ignores measurement error and non-random missingness of 20 economies."},3 {"id":"C2","text":"ln GDP per capita explains about 74% of cross-country variance in life expectancy (r = 0.86), halving prediction RMSE from 7.08 to 3.59 years versus the mean-only baseline.","results_keys":["r_squared","pearson_r","baseline_metric","model_metric"],"status":"supported","caveat":"In-sample fit; no out-of-sample validation."},4 {"id":"C3","text":"20 countries/economies were excluded in 2023 because GDP per capita PPP was missing; no imputation was done.","results_keys":["n_excluded_missing","data_issues"],"status":"supported","caveat":"Excluded set is non-random (conflict states, microstates), possible selection bias of unknown sign."},5 {"id":"C4","text":"The positive slope is robust to the choice of HC estimator, to dropping high-influence points, and holds in every year 2015-2023.","results_keys":["effect_estimate","effect_se"],"status":"supported","caveat":"Sensitivity numbers are in out/sensitivity.json (generated by analysis.py), not in results.json keys."}6]7