|06-24-2013, 04:01 PM||#1|
Join Date: Jun 2013
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P_value for Pearson Correlation
Working on a rather large dataset - many different things that I am attempting to find a correlation for...using Pearson correlation. (BTW - I am a programmer - stats & probability I am learning and attempting to use as I go.) Anyway, I am having some difficulty simply using Pearson correlation to correlate (see attached pdf for a small sample dataset) The problem is Pearson is giving a good correlation value for data that should be somewhat uncorrelated - for example:
 -1.061894 -1.061769 1.944929
 -2.223669 -2.215122 -2.074776
 0.9986946 <<<< would expect this to be somewhere between .3 and .6
Pearson's product-moment correlation
data: e and f
t = 19.5519, df = 1, p-value = 0.03253
alternative hypothesis: true correlation is not equal to 0
I see that the first 2 pairs are correlated - but the last pair should move things away from a high correlation. What is going on here? The p-value for the correlation leaves this correlation as statistically significant.
Last edited by Steve_in_MA; 06-24-2013 at 04:03 PM.