S-PLUS vs. Excel

From: Edward Hua (eyh5_at_ee.cornell.edu)
Date: 08/30/04 

Date: Mon, 30 Aug 2004 12:34:29 -0400

Hi,

   I have the following question about deriving an analytical/mathematical
expression for the PDF of a random variable from gathereing statistics.
Please e-mail me eyh5@ece.cornell.edu if you're able to answer it.

   I've gathered a bunch of statistics for a random variable, and have
come up with a statistical probability density function of it, and it
seems to resemble the heavy-tailed distribution. I want then to be able
to obtain an analytical expression for the PDF of this random variable.

   I'm wondering if anybody has had experience with both S-PLUS and
MS Excel.If so, could you tell me which one would give a more accurate trendline
with an expression expression given the statistical PDF curve? I'm using
Excel right now and just started learning S-PLUS.

   Also, I've noticed that in Excel, the mathematical expression for the
same set of data varies if the x-axis range changes. For example, the
expresion I got for the "power fit" trendline when the x-axis is from 0 to
60[sec] is quite different from if the x-axis is from 0 to 120[sec]. Could
someone explain this difference to me? And also, would this phenomenon
appear in S-PLUS as well?

   Thanks.

-Ed

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