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Pearsons


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#1 ferg

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Posted 02 May 2006 - 08:14 PM

With pearsons do you ignore the negative/positive sign when it comes to comparing the critical value with the calculated value??


#2 bred

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Posted 02 May 2006 - 08:36 PM

It shows you if the correlation is positive (which is when x tends to infinity as y tends to infinity, and x tends to 0 as y tends to 0) or negative (which is when x tends to infinity as y tends to 0, and x tends to 0 as y tends to infinity), assuming the value is above the critical value (or below if it is negative).
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#3 ninja-lewis

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Posted 06 May 2006 - 03:23 PM

Can anyone help me with finding the critical value (preferably for at 0.05) for 49 degrees of freedom when using the Pearson Product Moment Correlation test? I have a value of 0.279, which is more than the critical value for 50 (.273) but less than the value for 45 (.288). Can I state the significance of the correlation by working on the basis that the value for 49 is probably less than 0.279?

Thanks


#4 bred

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Posted 06 May 2006 - 09:07 PM

That should be fine, although you might want to say one or two little things regarding why it is probably <.279. Alternatively, you might want to just use 47 values (if possible) to keep things simple. I very much doubt you'd be expected to know the critical value for 95% significance with 49 degrees of freedom. I'm not sure how to find that out. The critical value for 90% significance at 43 degrees of freedom (when n=45) is only .243 btw.
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