Exercises

1. Find out what is “OOB estimate of error rate”? How to reduce its value?

2. In a random forest model, its Confusion matrix shows misclassified samples and their error rate. Explain the concept of the “Positive error” and “Negative error” how to balance them?

3. Try different sampling methods by using the different fold and repeat numbers in the Cross-Validation to see the effect of the tune parameters and model’s accuracy.

4. Explore train method in caret with different models and methods.