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dfink
Switzerland
1 Posts |
 Posted - 09/23/2013 : 08:47:46 AM
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Origin Ver. and Service Release (Select Help-->About Origin): 9.00
Operating System: Win7
Dear All,
I have a question regarding the Voigt fit. I would like to fit the Voigt function to a spectrum of peaks, which clearly have a Voigt profile.
When fitting with Voigt, it usually looks nice and Xi2 is ok, but unfortunately, the uncertainty for the centroid is huge for unknown reason.
I don't have this problem, when I am using the Lorentz-function or Gaussians separately. Uncertainties are small as they should.
However, I really would like to use Voigt instead. Is this just normal for fits with Voigt functions, is there a standard procedure (fix parameters, playing with widths etc.) or is this a bug?
It would be great, if someone could help me. Thanks a lot.
Best regards,
Daniel |
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Problem with Voigt fit - huge uncertainty for xc
