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Re: std

From: turbofib
Subject: Re: std
Date: Sat, 18 May 2019 05:54:53 -0500 (CDT) 
thank you for answer..

I need it because i want to use bollinger band

I tryed to use bolling (function of package financial octave) but the result
is  different from Excel Calculation

so I decided to calculate it by hand

Upper Band =Period-day SMA + (Period-day standard deviation of price x 2)
Lower Band = Period-day SMA – (Period-day standard deviation of price x 2) 



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