anakystFAR FRR EER – What is the BEST indicator of the accuracy of a biometric system? Which of the following metrics is the BEST indicator of the accuracy of a biometric system? False Rejection Rate Crossing Error Rate (CER) Equal Error Rate False Acceptance Rate Crossing Error Rate (CER): This is a commonly mistaken term. The correct term is Crossover Error Rate (CER), which is essentially another term for Equal Error Rate.