private void generateBOWSARFF(){
    	 TweetManager manager = new TweetManager();
         List<Tweet> tweets = manager.retrieveAll();
         try{
         	TweetToBagOfWordsConverter.createBagOfWordsARFF(tweets, "BagOfWordsIvan.arff");
         }
         catch(Exception e) {
             e.printStackTrace();
         }
    }