Fit a circle to (x,y) datapoints?

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Article #843

#843

From: Patrick Haggard
Date: Tue, 26 Jan 1993 14:14

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I have 40 (x,y) datapoints which I hypothesise form the arc of a 
circle of unknown origin and radius.  I want to find an estimate
of the radius of the circle.  The preferred platform is SAS:
I imagine proc nlin; would do it, but what is the neatest way
to specify y in terms of x.  Any suggestions on how to tackle this.
Thanks

Patrick Haggard

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Path: arc1-ca.pugleaf.net!sparky!uunet!pipex!unipalm!uknet!comlab.ox.ac.uk!ph
From: ph@physiology.oxford.ac.uk (Patrick Haggard)
Newsgroups: sci.math.stat
Subject: Fit a circle to (x,y) datapoints?
Message-ID: <1993Jan26.141416.13815@galen.physiol.ox.ac.uk>
Date: 26 Jan 93 14:14:16 GMT
Sender: ph@physiol.ox.ac.uk (Patrick Haggard)
Organization: Physiology Department, Oxford University, Oxford, UK.
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Originator: ph@galen.physiol