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Re: [Bug-gnubg] Gnubg - Snowie error rate comparison


From: Christian Anthon
Subject: Re: [Bug-gnubg] Gnubg - Snowie error rate comparison
Date: Sat, 10 Nov 2007 00:30:45 +0100

Snowie and GNU backgammon calculate error rate differently

>From an example game:

Chequer Play Statistics:
Total moves                                           26
Unforced moves                                      22


Cube Statistics:
Total cube decisions                                   4
Close or actual cube decisions                         3

Error rate (total)                                  -0.145
Error rate (per decision)                          -5.8
Equiv. Snowie error rate                          -2.8

gnubg error = 0.145/(22+3)*1000 = 5.8
snowie error = 0.145/(26*2)*1000 = 2.8

So as you can see GNU backgammon attempts to use the number of actual
decisions, while Snowie only uses the number of moves. In my
experience the factor between the two error rates is closer a factor
of 2.

Christian.




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