Experimental Results

• Newsgroup posting service - learns to assign documents to the appropriate newsgroup
• 20 newsgroups, 1,000 articles from each newsgroup, learn over 2/3. Random accuracy would be 5%. The program achieved 89%. Used algorithm above but only used words which occurred at least 3 times and were not the 100 most frequent (leaving 38,500 words).
• Usnet articles I find interesting - Newsweeder system - for some users increases rate of interesting articles from 16% to 59%