[Ifeffit] What confidence limit is implied in the error bars forleast-squares fitting in Athena

[Kelly, Shelly]

Hi Andrew,

 

If you are fitting XANES spectra with standards, a large source of
uncertainty can come from the representation of the standards in
matching the species in the sample.

 

Shelly

 

________________________________

From: ifeffit-bounces at millenia.cars.aps.anl.gov
[mailto:ifeffit-bounces at millenia.cars.aps.anl.gov] On Behalf Of Andrew
Sent: Thursday, October 02, 2008 3:49 PM
To: ifeffit at millenia.cars.aps.anl.gov
Subject: [Ifeffit] What confidence limit is implied in the error bars
forleast-squares fitting in Athena

 

Hi everyone,

 

I'm fitting data with the least-squares method in Athena and am not sure
what the error bars correspond to. What I mean, are these 95% confidence
limits, or is it some other statistical way for error analysis?  If
Athena says the weight of one phase is 0.049 (0.003), what confidence
are in the 0.003 error bar reported by Athena?

 

(I have done a PCA of the XANES, and XRDs of the samples and am pretty
confident in the phases that I'm fitting).

 

I greatly appreciate the help!

 

Andrew Campos

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