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Consider the mutual information based feature selection. Suppose we have the follow- ing table (the entries in table indicate counts) for the spam versus and
Consider the mutual information based feature selection. Suppose we have the follow- ing table (the entries in table indicate counts) for the spam versus and non-spam emails:
"prize"=1 | "prize"=0 | |
"spam"=1 | 150 | 10 |
"spam"=0 | 1000 | 15000 |
"hello"=1 | "hello"=0 | |
"spam"=1 | 155 | 5 |
"spam"=0 | 14000 | 1000 |
Given the two tables above, calculate the mutual information for the two keywords, "prize" and "hello" respectively. Which keyword is more informative for deciding whether or not the email is a spam?
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