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

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    [ http://tools.oasis-open.org/issues/browse/OFFICE-2387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17634#action_17634 ] 

Andreas Guelzow  commented on OFFICE-2387:
------------------------------------------

I just like to point out that current implementations do not always seem to consider that:

A1:  =10^300
A2:  =PI()*10^-100
A3:  =-(10^300)

A5: = SUM([.A1:.A3])
A6: = SUM([.A1],[.A3],[.A2])

A5 and A6 should contain the same result but neither in OpenOffice nor Gnumeric is that the case.

> 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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