[Ifeffit] Sixpack, PCA controll, "IND" column

[Baker, Leslie]

Amazon has lots of used copies.  I like original sources -- especially
since you can look at them and see, for example, that a particular
function is described under the heading, "Empirical Methods" instead of
relying on what someone told you on the Internet.

Sam's Sixpack paper cites Malinowski's 1977 paper, and both are
available online.
S M Webb (2005) SIXpack: a graphical user interface for XAS analysis
using IFEFFIT. Phys. Scr. T115, 1011.
E R Malinowski (1977) Determination of the Number of Factors and the
Experimental Error in a Data Matrix. Anal Chem 49, 612.

-Leslie

-----Original Message-----
From: ifeffit-bounces at millenia.cars.aps.anl.gov
[mailto:ifeffit-bounces at millenia.cars.aps.anl.gov] On Behalf Of Matthew
Marcus
Sent: Thursday, June 21, 2012 9:29 AM
To: XAFS Analysis using Ifeffit
Subject: Re: [Ifeffit] Sixpack, PCA controll, "IND" column

That book is out of print and hard to get.  You should refer to later
papers.

The IND function is not necessarily robust.  It's not rigorously
derived, but is sort of empirical.
	mam

On 6/21/2012 9:20 AM, Baker, Leslie wrote:
> This is the factor indicator function.  Its minimum can be used to 
> indicate the correct number of meaningful factors.
>
> There's an explanation here:
> http://www.vub.ac.be/fabi/multi/pcr/chaps/chap6.html
>
> For more information, see Malinowski's book Factor Analysis in 
> Chemistry.
>
> -Leslie
>
>
> -----Original Message-----
>
> Hello,
>
> does anyone know the meaning of the IND column in the PCA controll 
> field of sixpack (version 0.63)?
>
> I did not found a hint in the sixpack documentation.
>
> Best regards
> Joerg
>
>
>
> **
> Leslie L. Baker, Ph.D.
> Department of Plant, Soil and Entomological Sciences University of 
> Idaho Moscow, ID 83844-2339
> 208-885-9239
> http://scholar.google.com/citations?user=ejpH5p0AAAAJ
>
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> Ifeffit at millenia.cars.aps.anl.gov
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>

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