Article View: sci.math.num-analysis
Article #888Fitting Multiple Gaussians
From: Stephen Holland
Date: Tue, 15 Dec 1992 20:12
Date: Tue, 15 Dec 1992 20:12
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As requested here is a brief summary of the various replies
I received over the last week.
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1) Suggested algorithms:
-Simplex and Marquardt-Levenberg from Numerical Recipes, adpated to
the problem at hand
-Using a maximum liklihood method
-A few people mailed me lists of source code avaliable from
various archives, NetLib, and where-ever. Since many of these
have been posted, or pointers to them posted, I won't repost them.
2) Several people said that this sort of fitting is sensitive to
the initial guesses at the parameters so their initial values
and search regions should close to the "true" values.
3) Don't try to fit too many Gaussians to the data.
4) Subjective "chi-by-eye" type fitting is subjective. Just because
one fit "looks" better than another doesn't mean that it actually is
better.
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Again, thanks to those who responded.
steve
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<1gle6uINNl5k@iskut.ucs.ubc.ca>Path:
arc1-ca.pugleaf.net!sparky!uunet!olivea!spool.mu.edu!yale.edu!yale!gumby!destroyer!cs.ubc.ca!unixg.ubc.ca!crisium!hollandShow Full Headers
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Path: arc1-ca.pugleaf.net!sparky!uunet!olivea!spool.mu.edu!yale.edu!yale!gumby!destroyer!cs.ubc.ca!unixg.ubc.ca!crisium!holland From: holland@geop.ubc.ca (Stephen Holland) Newsgroups: sci.math.num-analysis Subject: Fitting Multiple Gaussians Message-ID: <1gle6uINNl5k@iskut.ucs.ubc.ca> Date: 15 Dec 92 20:12:14 GMT Reply-To: holland@geop.ubc.ca Followup-To: sci.math.num-analysis Organization: Geophysics & Astronomy, U.B.C. Vancouver, Canada Lines: 28 NNTP-Posting-Host: crisium.astro.ubc.ca