[Spambayes] (sorry if message is duplicated) Geometric Mean calculation

mbn anonymoususr at gmail.com
Wed May 14 09:55:34 CEST 2008

Hi Guys, 

Sorry for reviving an old topic, but I would like to get more information
about the geometric mean (GM) method devised by G. Robinson. The earliest
reference I could find is his article: 


Where he mentions that the geometric mean is consistent with Fisher's
method, but no more details are given: 

"The connection would take too much time to explain here, but it is a great
justification for why this should work really well." 

I understant GM is now obsolete and has been replaced in favor of Fisher's,
but I am interested in the derivation of the method (or at least the basic
intuition behind it) and its relationship with Fisher's. I could not find
any explanation in the archives of SpamBayes. 

The most similar thing to Robinson's GM I could find is "logarithmic opinion
pool" with weights wi=1/n and constant k=1, but I have no idea whether the
two things are related. 

Any explanation about the derivation of the GM method will be greatly

Thanks in advance
View this message in context: http://www.nabble.com/%28sorry-if-message-is-duplicated%29-Geometric-Mean-calculation-tp17225572p17225572.html
Sent from the Spambayes - General mailing list archive at Nabble.com.

More information about the SpamBayes mailing list