Basing Ratings on Statistics

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Basing Ratings on Statistics - 2/1/2007 11:20:33 AM

dp68

Posts: 6
Joined: 1/25/2007
Status: offline

This has probably been discussed ad finitum but I haven't found an appropriate thread using Search.

Is there a good primer for creating a player's ratings based around a set of statistics? For instance how does a batter's batting average, k's vs bb's, and power numbers project into CH, PH, and Eye.

Thanks if you can point me in the right direction!

Post #: 1

RE: Basing Ratings on Statistics - 2/2/2007 3:20:20 AM

KG Erwin

Posts: 8981
Joined: 7/25/2000
From: Cross Lanes WV USA
Status: offline

dp68, I'm trying to get an explanation of how this works, as my belief is that ratings are relative to the entire database of available players for a given year. In other words, I THINK there's a "grading curve", and using absolute stats won't work. THIS is what I hope means grading players from different historical eras into one all-inclusive database, but somehow I don't think that "normalized" stats are figured in.

(in reply to dp68)

Post #: 2

RE: Basing Ratings on Statistics - 2/2/2007 7:25:44 AM

JonnieR

Posts: 108
Joined: 8/19/2005
Status: offline

As I understand it the separate ratings are based on a player's stats relative to performance of all of the players. For instance if the "contact" rating is a function of the number of (At Bats - Strike outs)/At Bats, then you must calculate the mean and standard deviation for all the players in a league. Assuming a normal distribution you can then calculate an individual player's percentile ranking. Based upon the range for this particular rating, say 25 -100 for example you can calculate a player's ranking for making "contact". For instance a player with percentile of 75 (he is better at this rating than 74% of the players in the league), would have a contact rating of 81.

Theoretically every time you add a player to the database a rating may change because statistics for group change also.

(in reply to KG Erwin)

Post #: 3