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anonymous

  • 5 years ago

how to find correlation coeff in statistics???

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  1. anonymous
    • 5 years ago
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    Do you know the definition and can't use it, or is it the case you don't even have the definition?

  2. anonymous
    • 5 years ago
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    The population correlation coefficient is defined as\[\rho_{X,Y}=\frac{cov(X,Y)}{\sigma_X \sigma_y}=\frac{E[(X-\mu_X)(Y-\mu_Y)]}{\sigma_X \sigma_Y}\]

  3. anonymous
    • 5 years ago
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    The sample correlation coefficient is\[r=\frac{\sum_{i=1}^{n}(X_i-m_X)(Y_i-m_Y)}{\sqrt{\sum_{i=1}^{n}(X_i-m_X)^2}\sqrt{\sum_{i=1}^{n}(Y_i-m_Y)^2}}\]where \[m_X,m_Y\]are the *sample* means, and \[X_i,Y_i\]are your paired data points.

  4. anonymous
    • 5 years ago
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    Follow this example: http://www.youtube.com/watch?v=pBK6L7lJwwE

  5. anonymous
    • 5 years ago
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    He's using a different formula at the end, though it's actually derived from what I gave you above. Follow his method for your own data.

  6. anonymous
    • 5 years ago
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    I'm kind of busy right now, so I'm not able to go into it in much more detail at the moment, but if you need more help, let me know. It's not a hard thing to do (calculate the coefficient), just a pain to do online in this forum.

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