math - Include current observation in standard deviation calculation? -


this isn't question execution, more theory. i'm monitoring data flow daily , want calculate how many standard deviations mean today's value compared history. question is, should include today's value when calculating standard deviation , mean? or exclude it?

well, question trying answer is, current reading "unusual" considering collection of "usual" measurements. think makes sense if current reading excluded what's considered "usual"; otherwise have circular reasoning going on.


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