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[Comments] (2) Loaded Dice, Round 2: At Pat's suggestion I did some more number-crunching and put the results in Loaded Dice. First, check out Standard deviation of ratings over time. Although the average rating is higher for new games than for old games, the standard deviation is always about 0.8. That is: the average rating for any 1980 game is some number, plus or minus 0.8; and the average rating for any 2010 game is a slightly higher number, plus or minus 0.8. The range of opinion is surprisingly limited.

Also take a look at the huge new section on Ownership and the Trade Market, full of graphs and tables taken from BGG's information about how many people own a game, how many people want to own it, and how many want to get rid of it. Including but not limited to:

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Posted by bob at Sun Sep 11 2011 21:42

Seems like the excess should be normalized somehow. If the number of people claiming ownership isn't available (I didn't see it) then how about dividing by the number of people who rated the game?

The number of people who have Monopoly to sell is less than 2% of the number who rated the game, but for the Tom Clancy game that ratio is over 40%.

Posted by Leonard at Tue Sep 13 2011 08:41

The number of owners is available. My first stab at this was something similar to what you suggest, something like the ratio of people who wanted to keep it versus get rid of it, but that was a) more complex to explain, b) didn't give appreciably different results, c) caused data normalization problems when the denominator was zero, d) didn't answer questions having to do with numbers of games like "High-rated games with many excess copies" (games you should be able to get for cheap)?


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