[Bug-gnubg] Guestimated abs. rating too high ?

[max-d]

Joern Thyssen wrote

The absolute rating is based on a, somewhat arbitrary, linear
interpolation scheme:

epm     rating
0.000   2200
0.005   2050
0.010   1950
0.015   1850
0.020   1750
0.025   1600
0.030   1500=20
oo       500

We may very well shift the scale down to, say,

epm     rating
0.000   2050
0.005   1950
0.010   1900
0.015   1850
0.020   1750
0.025   1600
0.030   1500
oo       500

With this scale GGRaccoon would be rated at 1990 in the attached file.


What we really need is thousands of analysed matches to gather some
data=20

(rating, error rate per move)

we can do some statistics on. One match is simply not enough.=20

We could request users on rec.games.backgammon to send (rating, error
rate per move) from their matches on GamesGrid and FIBS. Once enough
data has been collected we can try to find a function that fits the
data.

J=F8rn

--=20
Joern Thyssen, PhD
Vendsysselgade 3, 3., DK-9000 Aalborg, Denmark
+45 9813 2791 (private) / +45 2077 2689 (mobile) / +45 9633 7036 (work)



Hi ,
if this can help

my rating on fibs was 1780
my rating on netgammon was 1882 (seems coherent with fibs one)
for both my experience was +-500

currently i have played 83 3 point matches and 12 7 point matches
vs gnubg expert .
I have played very seriously like i was playing on the bkgammon servers .
(never more than 2 matches pr day)

my average checker play error is 0.0126.
i won 47.5 % of the matches.
if i set Gnubg-expert rating to 1950 the 3 point matches gives me a
fibs rating of 1758
a netgammon rating of 1797

my overall rating for the 3 point matches :
beginner 2
novice 1
inter. 4
advanced 10 (according to my sever results i should be here !)
expert 29
WC 28
et 13


i also think the guestimated rating is too much optimistic
md.