Description: X-Test refers to the test dataset used to evaluate the performance of a predictive model. In the field of predictive analytics, it is essential to have a dataset that has not been used during the model’s training, as this allows for measuring its generalization ability and effectiveness in real-world situations. A well-designed X-Test should be representative of the data the model will encounter in its practical application, including a variety of cases and situations that may arise. The quality of the X-Test directly influences the validity of the conclusions that can be drawn about the model’s performance. Additionally, using appropriate metrics to evaluate performance on the X-Test, such as accuracy, sensitivity, and specificity, is crucial for obtaining a comprehensive and accurate assessment. In summary, the X-Test is an essential tool in the development process of predictive models, as it provides an objective and quantifiable evaluation of their performance under conditions that simulate real-world usage.