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Math Help - Spearman Rank value validity

  1. #1
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    Spearman Rank value validity

    I am using spearman rank to test the strength of the correlation between gradient and velocity along a river. i measured on 8 sites but my teacher says i need more sites for it to be mathematically correct.

    is this true?
    if not could you please provide a link to some proof or my coursework will be invalid.

    Thank you very much for reading
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  2. #2
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    Your sample size is not large enough, thus you would not get a low enough p-value to prove any statistical significance to your claim. Increase your sample size if you can.
    -Andy
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  3. #3
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    could you be more specific, how many values make it valid? also i have done the calculation and the result was a 90% correlation or thereabouts
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