Returns results of validation tests for COPD
validate_COPD.RdThis function runs validation tests for COPD model outputs. It estimates the baseline prevalence and incidence of COPD, along with sex-specific baseline COPD prevalence. Additionally, it calculates the baseline prevalence of COPD by age groups and smoking pack-years. It also estimates the coefficients for the relationships between age, pack-years, smoking status, and the prevalence of COPD.