[Ifeffit] CORRELATION MATRIX IN IFEFFIT

Hi folks I'm need to explore more the correlation matrix R(ij)given by ifeffit since my fit several variables are ajusted (the number is far bellow the number of independent data points). In my MACRO, the command correl (@all, @all, print) permit to obtain the correlation matrix. So I have some questions about the calculation of correlations (rij): 1) Is the correlations(rij) calculated in ifeffit the sample linear correlation which measures the linear dependence between two vectos (in this sense, I'm thinking the term vector as a nx1 matrix in which n corresponds to the sample size - perhaps the number of fit iteractions)? If so, can I use a conventional hypothesis test like t (t = rij*sqrt[(n-1)/(1-rij**rij)] and how many degress of fredon can I consider to fint the t score on the table of t student distribution? 2) As I need to explore more the correlation matriz I would like to know if someone uses principal component analysis on Rij or some other chemometric approach. Thank you very much Renato Canha Ambrosio -- Open WebMail Project (http://openwebmail.org) ---------- Original Message ----------- From: ifeffit-request@millenia.cars.aps.anl.gov To: ifeffit@millenia.cars.aps.anl.gov Sent: Wed, 22 Mar 2006 12:00:17 -0600 Subject: Ifeffit Digest, Vol 37, Issue 6

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Today's Topics:

1. GeO2 (Santiago J.A. Figueroa)

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Message: 1 Date: Tue, 21 Mar 2006 17:06:45 -0300 From: "Santiago J.A. Figueroa" Subject: [Ifeffit] GeO2 To: Message-ID: <004701c64d23$00f973a0$8c01010a@NEVERMIND> Content-Type: text/plain; charset="iso-8859-1"

Hi all,

Anyone out there have spectra for a GeO2 standard?

Thanks!

Lic. Santiago J. A. Figueroa Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) Fac. de Cs. Exactas. Universidad Nacional de La Plata Diag. 113 y 64 C.C.16 suc.4 (1900) La Plata TEL: (0221) 425 7430 interno: 144 FAX: (0221) 425 4642 WEB: www.inifta.unlp.edu.ar