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Math Help - Correlation help.

  1. #1
    Newbie
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    Correlation help.

    Hello forum,

    I stumbled upon this forum while looking up Google for information on my problem. I'm not sure if i'm using the right tool but let me state the problem first.
    From a survey feedback, i want to see if there is any correlation between a question that results in a "Yes" or "No" type data and another question that is on a scale of 1 to 5. The hypothesis is that when ever there is a "Yes", we are likely to see a higher score on the scale.
    How i prove this?

    Thanks for your help,
    -R
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by +rex View Post
    Hello forum,

    I stumbled upon this forum while looking up Google for information on my problem. I'm not sure if i'm using the right tool but let me state the problem first.
    From a survey feedback, i want to see if there is any correlation between a question that results in a "Yes" or "No" type data and another question that is on a scale of 1 to 5. The hypothesis is that when ever there is a "Yes", we are likely to see a higher score on the scale.
    How i prove this?

    Thanks for your help,
    -R
    Take the 1-5 score and multiply it by +1 if y, and -1 if n.

    Then if there is no correlation the distribution of modifed 1-5 score is uniform on {-5,-4,-3,-2,-1,0,1,2,3,4,5}. Use a chi-sq test to check this.

    This test is stronger that you asked for, you can weaken it by looking at the sample mean and testing it against 0 as a null hypothesis, and >0 for the alternative hypothesis.

    RonL
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  3. #3
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    May 2008
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    Thank you,

    Thank you, will give it a shot and let you know.
    -R
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