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Friday, November 16, 2007
Reliability of statistics
By Tangotiger, 04:44 PM
Print, read, put aside, re-read then come back here.
I really wish Pizza would have included the mean, not just the minimum, for each stat, but he said he’d get back to that later. The “intraclass correlation"-type equation I use is:
r = PA/(PA+x), where x is unique to each metric.
For things like OBP or wOBA, x is 200. This means that to get an r=.50, you need 200 PA. Pizza likes to use r=.70, which means you need a mean of 467. Pizza showed us that you need a minimum of 350 PA (which in the context that he chose, means a range of 350 to 700-odd PA), and therefore likely supports the standard equation that I use.
It’s a great post that he did, and a great service that he’s doing. But, I take exception to this part:
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