Talk:Perfect information
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"Complete does not imply perfect information; but if background uncertainty is modeled as "moves by nature," perfect implies complete information." - from http://dss.ucsd.edu/~vcrawfor/200CLectureNotes.pdf Is this true? I guess "moves by nature" here must refer to the assignment of types/payoff functions to participants(?)--Frank Guerin 18:09, 8 May 2005 (UTC)
Nature's move is the assignment of types to players (and their type determines their payoff function). In describing a game of incomplete information, one might treat it as if it were a game of perfect information since nature has revealed some actions to some players that it hasn't revealed to others (i.e their types), so players do not know the entire game history. This is due largely to work by John Harsanyi. He wrote a paper in 1967 called "Games with incomplete information played by Bayesian players". Treborbassett 08:08, 9 May 2005 (UTC)
Shouldn't this be merged with complete information? The definition given is exactly the same.
- The entry on complete information is misleading (at best). This should definately be fixed at some point (maybe I'll do it soon). Complete information means I know who the other players are and what the payoffs to their possible action are to them, but during the game I may not know what action they took (perhaps they made a choice in secret). Perfect information games are ones where at any given time I know what the other players did, there are no secrets. thanks for pointing this out, its a real problem! --Kzollman June 28, 2005 23:49 (UTC)
Why does a Google search and an internal link for "imperfect information" lead to "perfect information," yet this article doesn't even mention it? I would argue that the difference (at least as far as game theory is involved) isn't just merely semantic. Should it have its own internal link or should a part be added to this article, or neither? Collin Imhof 03:44, 3 April 2006 (UTC)
[edit] Huh?
"It is law of sociology that perfect information does not exist" Doesn't it exist in chess game? I mean... maybe.. .'that perfect information does not exist in marker' or 'in society'.. Dunno.. As analyzing games, it can obviously exist... that sentence seems as always it won't exist... Althrough at the begining it says about chess.. It looked odd, I think... 189.5.150.134 19:59, 31 March 2007 (UTC)
- I removed those two paragraphs, thanks for pointing them out. They sounded suspiciously like original research. If the original author can find a citation for these, then we can put them back in. Although, I suspect the wording would needed to be changed. --best, kevin [kzollman][talk] 20:42, 31 March 2007 (UTC)
[edit] German wiki & merge
Hi there!
in German wikipedia we have de:Spiel_mit_vollständiger_Information which means "Game with complete information" complete game. However, the link links to "perfect information" - not complete information.
Also, Solved_game is in german just a part of de:Gewinnstrategie.
However, there are only few links. I'd recommend to merge some of the articles into one, like perfect & complete information articles into somethink similar game theory, so we can link each other more easily.
Additionaly, there is (in german): de:Gewinnstrategie (meaning winning strategy).
Ok, I got a bit confused. Any suggestions?
--Bmhm 18:56, 19 July 2007 (UTC)
- Bmhm - Thank you for your comments, finding out how other languages do things can often offer new perspectives. Unfortunately, things here are a bit complicated. Complete game is, in fact, a term used in the sport baseball, and this term is not often used in English publications about game theory. I was previously unaware of Solved game, I will need to take a look at it. We had considered merging complete and perfect information into a single article. These refer to different concepts, but the English terminology introduces more confusion than it solves. To be honest, I don't remember what we decided about the merge. With regards to winning strategy, the only thing we have is a section in Determinacy about it, see Determinacy#Winning_strategies. --best, kevin [kzollman][talk] 19:54, 19 July 2007 (UTC)
[edit] perfect or imperfect information?
I feel confused our participation behavior from game theory perspective. In wikipedia or even other online communities, we may write down something after we read others' posts. Is it perfect information? Only next time we visit the same page, we can know what others respond to our posts. From this perspective, it seems that we don't know how others respond when we act. So it should be a simultaneous move. In this sense, the information is imperfect. I really feel confused about this question. who can answer it?SimonSun 07:54, 14 November 2007 (UTC)
