Beyond Accuracy: Balanced Accuracy as a Superior Metric for LLM Evaluation

This ArXiv paper highlights the importance of using balanced accuracy, a more robust metric than simple accuracy, for evaluating Large Language Model (LLM) performance, particularly in scenarios with class imbalance. The application of Youden's J statistic provides a clear and interpretable framework for this evaluation.

• •Balanced accuracy is a superior metric for LLM evaluation compared to raw accuracy, especially when dealing with imbalanced datasets.
• •Youden's J statistic provides a clear method for calculating and interpreting balanced accuracy.
• •The findings have implications for the development and deployment of more reliable LLM-based systems.