The Correlation Matrix show correlation among two or more variables. Correlation refers to any statistical relationship between any given variables. In many statistical methods correlation matrices are relied upon for initial data. Strength of correlation is represented by decimals where as the closer to 1 the variable the stronger the positive relationship and the closer to -1 the stronger the negative relationship. Number close to zero represent a weak correlation. The correlation between two variables is represented by using different shades of color to represent correlation as seen in the diagram below.
http://journalofvision.org/4/4/9/figa10.gif
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