Anchors

hyperpape · **#21**

Yeah, that's one of the major tradeoffs rating systems have to deal with. Transparency is great, and is the most important thing for some people, but all the transparent systems we know about lose some accuracy.

Kirby · **#22**

hyperpape wrote:

Yeah, that's one of the major tradeoffs rating systems have to deal with. Transparency is great, and is the most important thing for some people, but all the transparent systems we know about lose some accuracy.

For some definitions of accurate :-)

skydyr · **#23**

Kirby wrote:

hyperpape wrote:

Yeah, that's one of the major tradeoffs rating systems have to deal with. Transparency is great, and is the most important thing for some people, but all the transparent systems we know about lose some accuracy.

For some definitions of accurate :-)

The real question is 'what is accuracy and how does that compare to the goals of the rating system?'

Kirby · **#24**

skydyr wrote:

The real question is 'what is accuracy and how does that compare to the goals of the rating system?'

Sure. From a personal perspective, the goals that I have for a rating system to have is for games against players of the same rank to be enjoyable. But what is enjoyable can also vary from person to person, so even if someone shares this goal, they might have different rating system preferences.

oren · **#25**

SmoothOper wrote:

Something has to be said for the transparency of a point based rating system, though it sounds like the anchoring is a step in the right direction. When I log into IGS, there are X number of people of above me and if I win Y more than I lose, then I go up a rank(or lose Z more than I win, I go down a rank).

IGS requires a bit of honesty to make it work. If everybody joined stating they were a high dan, it would be broken compared to other ranking systems fairly quickly.

Mef · **#26**

skydyr wrote:

Kirby wrote:

hyperpape wrote:

Yeah, that's one of the major tradeoffs rating systems have to deal with. Transparency is great, and is the most important thing for some people, but all the transparent systems we know about lose some accuracy.

For some definitions of accurate :-)

The real question is 'what is accuracy and how does that compare to the goals of the rating system?'

Generally for a rating system, accuracy is the ability to correctly predict the outcome of a game between two players. To that end KGS does very well, especially compared to most other systems.

As far as the goals of a rating system, accuracy is a primary goal of KGS's and not necessarily that important to some others.

Kirby · **#27**

Mef wrote:

Generally for a rating system, accuracy is the ability to correctly predict the outcome of a game between two players. To that end KGS does very well, especially compared to most other systems.

KGS does well, assuming that someone has an unchanging rank. If someone is 5k, and they're going to be 5k forever, then the maximum likelihood approach correctly uses history to estimate a rank. If someone is improving, KGS does not do so well compared to some of the other online systems, because past history makes it such that playing a lot of games makes it harder to adjust your rank, even if you have genuinely improved.

While it's true that KGS can do well with players that are not improving (or declining in skill), it is misleading to say that it universally does a good job of correctly predicting game outcome, when other systems that are not weighted so heavily by the history of past games do better in some circumstances.

Case in point: If KGS were accurate, people would not be inclined to create new accounts just to get a correct rank. We see this happen on a regular basis.

UnclMartin · **#28**

When the drop in ratings was reported, the super admins checked the anchors and found one of them had stopped playing. The anchors have been adjusted, effective December 26.

daal · **#29**

UnclMartin wrote:

When the drop in ratings was reported, the super admins checked the anchors and found one of them had stopped playing. The anchors have been adjusted, effective December 26.

Why wasn't the adjustment done so that drop in ratings got corrected? Just askin...

DrStraw · **#30**

daal wrote:

UnclMartin wrote:

When the drop in ratings was reported, the super admins checked the anchors and found one of them had stopped playing. The anchors have been adjusted, effective December 26.

Why wasn't the adjustment done so that drop in ratings got corrected? Just askin...

Why bother? Ratings are relative anyway. The same handicaps will be generated. No need to go to a lot of extra work.

hyperpape · **#31**

DrStraw wrote:

Why bother? Ratings are relative anyway. The same handicaps will be generated. No need to go to a lot of extra work.

DrStraw's signature wrote:

Still officially AGA 5d but I play so irregularly these days that I am probably only 3d or 4d over the board (but hopefully still 5d in terms of knowledge, theory and the ability to contribute).

Pippen · **#32**

UnclMartin wrote:

When the drop in ratings was reported, the super admins checked the anchors and found one of them had stopped playing. The anchors have been adjusted, effective December 26.

Who was that anchor (nickname)?

UnclMartin · **#33**

daal wrote:

UnclMartin wrote:

When the drop in ratings was reported, the super admins checked the anchors and found one of them had stopped playing. The anchors have been adjusted, effective December 26.

Why wasn't the adjustment done so that drop in ratings got corrected? Just askin...

I do not know. Maybe there is a problem with another anchor? Maybe one of you should send some specific examples via email to the admins.

UnclMartin · **#34**

Pippen wrote:

UnclMartin wrote:

When the drop in ratings was reported, the super admins checked the anchors and found one of them had stopped playing. The anchors have been adjusted, effective December 26.

Who was that anchor (nickname)?

I do not know, since managing anchors is a super-admin function. Even if I did know, I would not be allowed to say.

UnclMartin · **#35**

Shawn Ligocki wrote:

Counter-example: I did not play any KGS games in November, but my rank magically jumped from 13k to 8k!

Of course, then I played a few games and quickly dropped back to 10k :oops:

But there was definitely some sort of odd drift there, maybe that was anchoring? Our just the players I beat getting better?

http://www.gokgs.com/graphPage.jsp?user=sligocki
http://www.gokgs.com/gameArchives.jsp?u ... 3&month=10
http://www.gokgs.com/gameArchives.jsp?u ... 3&month=12

Not all issues with ranks are related to anchors.

The rank system keeps track of a degree of certainty about your rank. You had a new account with few ranked games in October, so the degree of certainty might have been low. When you did not play in November, your rank may have drifted up due to an issue in the rank system: When the degree of certainty is low, often because one stops playing ranked games, a bug causes the rank to drift toward 2 dan.

skydyr · **#36**

UnclMartin wrote:

The rank system keeps track of a degree of certainty about your rank. You had a new account with few ranked games in October, so the degree of certainty might have been low. When you did not play in November, your rank may have drifted up due to an issue in the rank system: When the degree of certainty is low, often because one stops playing ranked games, a bug causes the rank to drift toward 2 dan.

Why 2 dan?

Nyanjilla · **#37**

skydyr wrote:

UnclMartin wrote:

The rank system keeps track of a degree of certainty about your rank. You had a new account with few ranked games in October, so the degree of certainty might have been low. When you did not play in November, your rank may have drifted up due to an issue in the rank system: When the degree of certainty is low, often because one stops playing ranked games, a bug causes the rank to drift toward 2 dan.

Why 2 dan?

Good question....

Pippen · **#38**

UnclMartin wrote:

Pippen wrote:

UnclMartin wrote:

When the drop in ratings was reported, the super admins checked the anchors and found one of them had stopped playing. The anchors have been adjusted, effective December 26.

Who was that anchor (nickname)?

I do not know, since managing anchors is a super-admin function. Even if I did know, I would not be allowed to say.

I am "rs220675" at KGS and I stopped (completely) playing on 11/30/2013. Would just be "cool" if I caused all the tempral rank mess

.

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