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Subject: [OASIS Issue Tracker] Created: (OFFICE-2309) LEGACY.CHITEST
LEGACY.CHITEST -------------- 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.] -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://tools.oasis-open.org/issues/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
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