# False positive rate with filtering

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### Poll: What is the false positive rate of your spam filter? (2 member(s) have cast votes)

#### What is the false positive rate of your spam filter?

1. less than 0.01% (1 votes [50.00%])

Percentage of vote: 50.00%

2. between 0.01% and 0.1% (1 votes [50.00%])

Percentage of vote: 50.00%

3. between 0.1% and 1% (0 votes [0.00%])

Percentage of vote: 0.00%

4. between 1% and 3% (0 votes [0.00%])

Percentage of vote: 0.00%

5. bewteen 3% and 5% (0 votes [0.00%])

Percentage of vote: 0.00%

6. greater than 5% (0 votes [0.00%])

Percentage of vote: 0.00%

7. I don't keep track of false positives (0 votes [0.00%])

Percentage of vote: 0.00%

Vote Guests cannot vote

### #1 Paranoid

Paranoid

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• Full Member
• 533 posts

Posted 21 June 2004 - 12:49 PM

False positives are situations where the spam filter classified a good email (ham) as spam. They are calculated using the following formula

no of good emails classified as spam / total number of good emails.

E.g. if Your mail filter classified 100 emails as 90 spam and 10 good and of the 90 classified as spam, 2 are good, your false positive rate = 2/10 *100% = 2%

This is an important measure because it measures are likely you are to wrongly junk a good email. If you have a false positive rate of 2% it means if you trust the filter fully, and don't trust for mistakes, you will lose 2 good emails wrongly classified as junk spam out of every 100 good emails.

Edited by Paranoid, 06 July 2004 - 11:50 AM.

Please note that the software I recommend above is entirely based on only my own experience and testing. In no way should my comments,opinions and endorsements be construed as an endorsement by the forum, nor do they reflect the advise or recommendations by the experts or helpers at spywareinfo.

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