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Thread: using mann whitney vs chi square

  1. #1
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    using mann whitney vs chi square




    Hi,

    I am wondering whether I should be using a chi square or a mann whitney test for comparing my data.

    I have two groups of people and want to compare the length of time they took to complete some work. 'The length of time' variable is four points on an ordinal scale (<2years; 2-3 years; 3-4 years and >4 years). I figured that the 'length of time' variable can also be treated as categorical.

    I am wondering if it is worth running a mann whitney on a four point scale, or whether I should just stick with a 2x4 chi square to compare the relationships?

    Thanks very much for any suggestions

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    Re: using mann whitney vs chi square

    Without seeing your data, I would go for the chi-square . With only 4 categories you might get a low resolution in mann-whitney , with lots of ties so it just feels like not being so reliable.

    regards
    rogojel

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    Re: using mann whitney vs chi square

    Yes, I agree with rogojel. Plus, I would inspect the standardized residuals to spot significant deviations from independence.

    Cheers
    Gm
    http://cainarchaeology.weebly.com/

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    Re: using mann whitney vs chi square


    Thanks very much for your help guys.

    rogojel - can I check what you mean by 'low resolution' when using the Mann Whitney?

    Thanks,

    Sam

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