Evaluating the performance of ChatGPT-5, Claude, and DeepSeek for statistical analysis in medicine

Large language models (LLMs) are increasingly used in biomedical research for data analysis and statistical support. However, their reliability in selecting appropriate statistical tests and generating correct software commands remains insufficiently evaluated. This study aimed to compare the performance of ChatGPT-5, Claude, and DeepSeek in identifying statistical tests and generating corresponding Stata 15 commands.