Soon or later those conducting data mining studies will need to compute standard errors for several statistics.
Every statistic from a sample distribution has a standard error that is specific to that statistic. Using the incorrect definition for a standard error invalidates any research study.
A tutorial on standard errors is now available from miislita.com.
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Funny all these “rebuttals”. I don’t understand why they keep considering correlation coefficients additive. Evidently they are now in the business of saving face and damage control.
The tutorial on correlation coefficients is available now.
http://www.miislita.com/information-retrieval-tutorial/a-tutorial-on-correlation-coefficients.pdf
A full response to SEOmoz “rebuttal” and alleged “knowledge” on statistics is available now at http://irthoughts.wordpress.com/2010/07/12/on-seomoz-knowledge-about-statistics/.
In addition, a tutorial on the correct way of computing and analyzing correlation coefficients is available at http://www.miislita.com/information-retrieval-tutorial/a-tutorial-on-correlation-coefficients.pdf
I hope this helps.