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+====== Standard Deviation Formula in Hibernate ======
+There isn't any standard deviation formula in hibernate:
+http://stackoverflow.com/questions/740293/is-it-possible-to-do-standard-deviation-in-nhibernate/17786363
+However, I think that the better approximation is to calculate it using the following formula:
+<code>
+sqrt((sum(value*value)/count(value)) - (avg(value) * avg(value)))
+</code>