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MathGroup Archive 2005

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regress versus fit - force through zero/force constant term to zero

  • To: mathgroup at smc.vnet.net
  • Subject: [mg61493] regress versus fit - force through zero/force constant term to zero
  • From: Chris Chiasson <chris.chiasson at gmail.com>
  • Date: Wed, 19 Oct 2005 23:08:08 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi MathGroup,

If I have:
<<Statistics`LinearRegression`
FAASCalPts={{1,0.032},{2,0.067},{5,0.183}}
FAASCalFit=Fit[FAASCalPts,{cCaPos},cCaPos]
FAASCalRegression=
  Regress[FAASCalPts,{cCaPos},cCaPos,
    RegressionReport\[Rule]{SummaryReport,BestFit}]

I expect the answer from Fit, but not the one from Regress. Regress
seems to be ignoring the fact that I only want the first order (and
not the zero/constant order) term.

How do I obtain fit diagnostics if I am forcing a 0 for the constant order?

Thank you,
--
Chris Chiasson
http://chrischiasson.com/contact/chris_chiasson


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