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[amibroker] Standard Deviation calculation question



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I'm experimenting with a standard deviation exploration but I'm 
getting discrepencies in the resulting answer.  Take Alcoa for 
example.  I get a 5 day Sd of 67 in Amibroker but a SD of 65 in 
Excel.  I tried this over 5 & 10 day periods for other stocks and 
got conflicting answers as well.  Is it because AB is a "moving" 
standard deviation?  

>From the AB help file:  Calculates moving standard deviation of the 
ARRAY over periods bars  


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