[OASIS Issue Tracker] Created: (OFFICE-2387) 5.18.56 PEARSON

5.18.56 PEARSON
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                 Key: OFFICE-2387
                 URL: http://tools.oasis-open.org/issues/browse/OFFICE-2387
             Project: OASIS Open Document Format for Office Applications (OpenDocument) TC
          Issue Type: Bug
          Components: OpenFormula
    Affects Versions: ODF 1.2 Part 2 CD 2
            Reporter: Patrick Durusau


Text under Semantics reads:

"Implementations should be wary of actually calculating PEARSON this way, due to numerical instability issues."

"...be wary..."? Perhaps a note, if it says what those "issues" may be. 

BTW, in researching this function I found: http://www.statemaster.com/encyclopedia/Correlational-research

It may just be a presentation issue but does the square root on the denominator extend across both of the summation signs?

Oh, the resource I cite above alleges a better way to calculate this function with numeric stability. 

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