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tark
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here is a question that should be interesting. How many ABs or IPs are reasonable before deciding a player is a loser or a winner, a keeper or a get the heck off my team player
2/10/2010 3:01 AM
elbirdo
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Assuming a full season of 700 PA's (population)

You can be 95% sure (confidence level)

that your players numbers will be within 5% (confidence interval)

after 248 PA's (sample size)

http://www.surveysystem.com/sscalc.htm
2/10/2010 5:36 AM
tark
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thank you
2/10/2010 8:44 AM
tark
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elbirdo gave me info on batters how about pitchers
2/10/2010 3:53 PM
elbirdo
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Quote: Originally Posted By tark on 2/10/2010elbirdo gave me info on batters how about pitcher
Gonna depend on the number of innings your pitcher would pitch in a full season - for 300 innings, you should know after about 169 innings - use the link to the calculator above - for 75 innings (like a reliever) it will take 63 innings.
2/10/2010 4:55 PM
tark
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thanx you are a big help
2/10/2010 9:54 PM
rbow923
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3 or 4 seasons.
2/10/2010 11:49 PM
CarlosVal
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Of course the 5% elbirdo quotes actually means 50 batting points....

Take a .250 hitter after 248 AB (not PA). The 95% CI is given by [.196, .304], because

.250 + 1.96 SQRT(.25*.75/248) or [.250 - 0.054, .250 + 0.054].

So it's true that it is 5% in absolute terms, but it can represent 20% of the hitter's batting average.
2/11/2010 12:36 PM
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