[OASIS Issue Tracker] Created: (OFFICE-2309) LEGACY.CHITEST

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

LEGACY.CHITEST
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                 Key: OFFICE-2309
                 URL: http://tools.oasis-open.org/issues/browse/OFFICE-2309
             Project: OASIS Open Document Format for Office Applications (OpenDocument) TC
          Issue Type: Sub-task
          Components: OpenFormula
    Affects Versions: ODF 1.2
            Reporter: Robert Weir 


3.) LEGACY.CHITEST
> Note: Applications usually describe the CHITEST function as a 
> Chi-square independence test. From a mathematical point of view this 
> is not correct, as that would not involve testing some actual data 
> against a set of expected values. It resembles more a Goodness-for-Fit 
> test, but how the degree of freedom is calculated actually doesn't 
> make sense then. This is specified to be inter operable with Excel and 
> OpenOffice.org. Gnumeric gets different results if the number of rows 
> and columns both are greater than 2.

Well, I suggest comparing the results with the FISHER-EXACT test, e.g. in R.

Also, every statistical package (R, EPI INFO, SPSS, ...) do NOT need the 
expected values, as they compute them automatically from the n*m table. 
I wonder why spreadsheets do NOT do it automatically, as well. Most 
users simply fail to compute the correct value. Well, I try to teach 
them, but almost everyone will get it wrong a week later. [It is way 
easier to remember the shortcut for a 2x2 table, aka (ad-bc)^2 * N/(n1 * 
n2 * n3 * n4), where n1-4 are the 4 subtotals, then compute accurately 
the expected values.]



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