NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Precise index correction: was- Eye problems and IE, IC
From: Bill B
Date: 2006 Jul 14, 04:33 -0500
Alex replied
> I think one can always see from context which SD Bill is talking about,
> but if we want to decide on a different abbreviation, I proipose
> "sigma" for the standard deviation, which is consistent with
> the standard mathematical notation for it by a Greek letter,
> and will never be confused with anything else.
A very dumb question from a layperson,
I have, probably mistakenly, the impression that "sigma" is also used as the
"sum" for a series. Therefore I am confused. Is sigma always used as the
square root of the variance, or only in a statistical context?
Bill
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From: Bill B
Date: 2006 Jul 14, 04:33 -0500
Alex replied
> I think one can always see from context which SD Bill is talking about,
> but if we want to decide on a different abbreviation, I proipose
> "sigma" for the standard deviation, which is consistent with
> the standard mathematical notation for it by a Greek letter,
> and will never be confused with anything else.
A very dumb question from a layperson,
I have, probably mistakenly, the impression that "sigma" is also used as the
"sum" for a series. Therefore I am confused. Is sigma always used as the
square root of the variance, or only in a statistical context?
Bill
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to NavList@fer3.com
To , send email to NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---
