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Originally Posted by Dunbar
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(emphasis added)
Why "limit the study by going back only to 1999"? Maybe I'm missing something, but why look at a subset of the 1992-2007 data? Is Roman picking a subset that looks worse than the full data?
I may be missing a valid reason.
--Dunbar
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The reason is that Dr Roman didn't start computing PF's until 1999 so analysis prior to that would be impossible.