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Tuesday, July 22, 2008
Intraclass correlation
Pizza talks about it all the time, and has a blog post to it. But, darned if I know what it’s actually doing. When I do my thing, I figure the z-score for the stat for each player (number of standard deviations, SD, from the mean), and then calculate the SD of the z-scores. The correlation is r = 1 - 1/SDzScore^2. So, if the SD of all the z-scores is 1.41, then r = .50. If it’s 2.0, then r=.80. I think this is what Pizza also does, and so, I guess I’m doing an intraclass correlation without even knowing it. Regardless, what I do seems sound. I like what Guy said in the comments in response to my comment:
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