Annotations for "STDEV (Transact-SQL)" topic.Sat, 06 Feb 2016 07:36:41 Z
http://msdn.microsoft.com/en-us/library/ms190474(v=sql.105).aspx#CommunityContent
Skip HokinDifference between STDEV and STDEVPSTDEV calculates standard deviation dividing by N-1. In other words, this is unbiased std dev for sample. For N = 1, this function would return NULL. $0
STDEVP calculates standard deviation dividing by N. In other words, this
is biased std dev assuming your data represents larger population very well (instead of just being small sample). For N = 1, this function would return 0. $0Thu, 11 Aug 2011 13:14:27 -0700