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Thread: Results of Sign Test

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    Results of Sign Test




    Hi all,

    I was hoping somebody could help me with understanding the results of a sign test.
    I am not a statistician but a medic trying to understand statistics for medical research purposes.
    After applying a sign test to 2 sets of data my results resulted in a negative score :
    z = (p - π)/SE(p) = (0.4 0.5) = - 0.1/0.158 = - 0.63.

    This shows that we have insufficient evidence to prove the null hypothesis, but I was wondering what is the significance of a negative score? What if the result was positive?

    I appreciate any advice, many thanks!

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    Re: Results of Sign Test

    are you using the wilcoxon sign rank test or which one? what happens when you flip the order of the groups? have you graphed data with say a boxplot or histograms?
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    Re: Results of Sign Test


    Hi hlsmith,

    thanks for your reply i really appreciate your time. I am using the basic sign test, not the wilcoxon. The data was 2 sets of 12 people rating how satisfied they were and comparing the 2 groups A and B. We used a Visual Analogue Scale scoring from 1 - 10. Results :

    A B A-B Sign
    7 5 +2 +
    6 6 0
    4 8 -4 -
    8 7 +1 +
    4 10 -6 -
    1 5 -4 -
    7 7 0
    2 6 -4 -
    5 8 -3 -
    8 7 +1 +
    8 9 -1 -
    5 4 +1 +


    So we used a simple sign test, which i understand but wondering why the negative result?
    Thanks again for any help

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