Re: regress versus fit - force through zero/forceconstant term to zero
- To: mathgroup at smc.vnet.net
- Subject: [mg61505] Re: [mg61493] regress versus fit - force through zero/forceconstant term to zero
- From: "David Annetts" <davidannetts at aapt.net.au>
- Date: Thu, 20 Oct 2005 05:01:13 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Hi Chris,
> 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?
You need IncludeConstant->False as an option for Regress ...
FAASCalRegression =
Regress[FAASCalPts, {cCaPos}, cCaPos,
RegressionReport -> {SummaryReport, BestFit},
IncludeConstant -> False
]
Regards,
Dave.