Dear Mark,
I am really amazing of your weka tool. It is awesome. I have some doubts in the tool. It regrading preprocess step. Without preproceesing I got 85% accuracy after data.weka.filters.unsupervised.attributes.addid, my accuracy went by nearly cent. How it is possible?. What action actually takes place? Is it a correct process I follwed? I need it. Please respond on it. Thank you.