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I have a problem involving moments and kurtosis. How do I prove , (m4)/(m2)^2 >= 1 where m4 is the 4th central moment and m2 is the 2nd central moment. The ratio (m4)/(m2)^2 is a measure of kurtosis. the only thing i know is that we can prove this by Cauchy- Schwarz inequality. Indrajit. _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com