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Thread: Are there any post hoc analyses for Chi Square data?

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    Are there any post hoc analyses for Chi Square data?




    Hi,
    I've got some Chi square results that I would like to analyze post hoc. Any ideas? I've got categorical data.
    Kind regards
    Brionny

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    Here's
    a bit more detail. I have this data

    Aircraft type
    fixed rotary
    taxonomy 2 25 6
    4 50 20
    6 40 22
    7 45 42

    A chi-square test on this data gives me X2 (11.1,3, p = .011). (or if
    done on %s X2 (8.78,3, p=.032)
    Now I would like to describe the %s and I was wondering if there was a
    way of saying these, in turn, are significant.... for example,

    "Taxonomy 7 errors were accountable for 44.2% of all rotary wing
    incidents, which was approximately 2x higher that taxonomy 7 errors
    incurred in fixed wing incidents (23.3%). A further 'test of
    association' (?) showed these differences were indeed significant (p=.
    05) (?)."

    Does that make more sense?
    Brionny

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    I think the short answer is no.

    However you could try fitting a logit link model to your data. In systat at least the output compares each level of the DV to each other giving it an odds ratio. You can then take the differences between the odds ratios of the groups you are interested in.

    Phil

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