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Thread: Which statistical test shall I use please? Thanks a lot

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    Which statistical test shall I use please? Thanks a lot




    Hi I am trying to compare 2 groups- one that has had surgery on the same leg (37) vs opposite leg (48) and to compare whether there is any significant difference in failure of surgery same leg failure (3) vs opposite leg failure (7). Which statistical test is best to use for this?

    Many thanks.

    Sarah

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    Re: Which statistical test shall I use please? Thanks a lot

    Hi Sarah, how have you defined/measured your dependent variable "failure of surgery"?
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    Re: Which statistical test shall I use please? Thanks a lot

    hi,
    it would be a two sample p-test. I just did it with your data and there is no significant difference.
    generally you need a bit more data to get practical results in such cases, especially, more failures.

    This is of course assuming, that the failure is correctly identified.

    regards

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    Re: Which statistical test shall I use please? Thanks a lot


    Side note, your sample size is small but I would imagine that there could be baseline characteristics (confounders) that may need to be addresses in this comparison. For example, by chance there are more diabetics or obese persons in one group compared to the other group and those variables are also associated with failure). Unless you randomize the leg or stratified legs then randomly picked who would get a surgery.
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