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Correlation

Lead Author(s): NancyHills
Measures of correlation are not statistical tests of inference, but are actually descriptive statistical measures which represent the degree to which two or more variables are related to one another. After calculating a measure of correlation, such as the Pearson product-moment correlation coefficient or the Spearman’s rank correlation, an inferential statistical test is often used to evaluate hypotheses regarding the correlation coefficient. E.g., we may wish to test the null hypothesis that a correlation between two variables equals 0.

Correlation is concerned with trends: if X increases, does Y tend to increase or decrease? How much? How strong is this tendency?

Topic attachments
I Attachment Action Size Date Who Comment
docdoc Correlation.doc manage 150.0 K 19 Jun 2009 - 13:44 CTSpediaAdmin  
pngPNG correlationtable.PNG manage 24.7 K 06 Mar 2009 - 17:18 NancyHills  
Topic revision: r5 - 01 Aug 2011 - 12:39:11 - MaryBanach
 

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