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Flexi  
#1 Posted : Sunday, December 18, 2011 12:22:35 PM(UTC)
Flexi

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Groups: Registered, Registered Users, Subscribers
Joined: 5/27/2006(UTC)
Posts: 135

Below is the data with metastock giving 12 period standard deviation value of 0.74449

Using the data the online 12 period standard deviation gives 0.77759

Using manually calculation the correct standard deviation should be 0.77759 and not 0.74449

What is making the different

http://www.uploadhouse.com/viewfile.php?id=15257260

What does your metastock gives?

11/28/2011 27.77 11/29/2011 27.34 11/30/2011 29.41 12/1/2011 29.53 12/2/2011 29.63 12/5/2011 30.09 12/6/2011 29.93 12/7/2011 29.8 12/8/2011 28.81 12/9/2011 30.15 12/12/2011 29.38 12/13/2011 28.56 12/14/2011 28.02 12/15/2011 28.35 12/16/2011 28.17
wblam  
#2 Posted : Monday, December 19, 2011 2:01:12 AM(UTC)
wblam

Rank: Advanced Member

Groups: Registered, Registered Users
Joined: 11/25/2006(UTC)
Posts: 79

0.74449 is the standard deviation of the sample.

0.77759 is the estimated population standard deviation by the sample.

Read more from here: http://en.wikipedia.org/wiki/Standard_deviation
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