I watched this video http://www.youtube.com/watch?v=0UdOIF3dvR8&
;feature=channel&list=UL to learn how to remove noise from a dataset. At minute 6:13, using backward elimination,the guy shows a decision tree . it takes a long time to see result. I had to wait for 13 hours. How do I know it hanged or it is working? My computer's memory is 4GB and my dataset contains 4000++ examples and 1000 attributes, If I stop it and save it, can I resume it at its current state the next time?