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

    [ http://tools.oasis-open.org/issues/browse/OFFICE-2387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17627#action_17627 ] 

Eike Rathke commented on OFFICE-2387:

I remember we added that because a public comment said that if the mathematical formula given was implemented straight forward the algorithm would lead to numerical instability due to cancellation errors. Which is correct, but we do not define how a given formula is to be implemented in an algorithm.
The wording "be wary" may need be reformulated.
"Deleted until rewritten" usually is not a good approach because then we may lose details or context.
Change in draft18 not accepted.

> 5.18.56 PEARSON
> ---------------
>                 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
>            Reporter: Patrick Durusau
>            Assignee: Andreas Guelzow 
>             Fix For: ODF 1.2 Part 2 CD 2
> 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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