Thursday, October 25, 2012

Understanding the Sign of Correlation Coefficient

In many books on Statistics, it is often stated that correlation between two variables X and Y is positive if, as X increases Y also increase. This interesting article by Dr. Sudhakar Kunte shows that this statement is not always correct:

http://www.stat.auckland.ac.nz/~iase/publications/1/3b2_kunt.pdf

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