Breidbart Index - Skirvin-Breidbart Index (SBI, BI3)

Skirvin-Breidbart Index (SBI, BI3)

The name Skirvin-Breidbart Index and the abbreviation SBI are mentionend in the Spam Thresholds FAQ. However, in hierarchy nl.* this index is called BI3.

The SBI is calculated similar to the BI2 but adds up the number of groups in Followup-to: (if present) instead of the number of groups in Newsgroups:. This encourages the use of Followup-to:.

Example

Two posts contain the same text. One is crossposted to 9 groups. The other is crossposted to 16, with four groups in Followup-to:.

$\frac{\sqrt{9} + \sqrt{16} + 9 + 4}{2} = \frac{3 + 4 + 9 + 4}{2} = \frac{20}{2} = 10$

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