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    Re: Precise index correction: was- Eye problems and IE, IC
    From: Bill B
    Date: 2006 Jul 14, 17:26 -0500

    > Bill,
    > Sigma as a sum of the series is the capital (upper case)
    > sigma, and sigma as a variance is a small (lower case)
    > sigma, so there will be no confusion on this list,
    > even if sometimes we will discuss series, which is unlikely:-)
    > (Lower case sigma looks somewhat similar to number 6).
    >
    >> Therefore I am confused. Is sigma always used as the
    >> square root of the variance, or only in a statistical context?
    >
    > It is a standard notation is probability and statistics.
    >
    > Alex.

    Alex

    Thanks for slightly shrinking my large sphere of ignorance.  Sigma, oops
    sigma, works for me unless I start a sentence with it ;-)

    Bill


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