Bruce,
According to what you said above, Nvar = 7, so nu=24.83, which is much closer to 23.54.
of course. My mistake. But still...
That still seems bigger than rounding errors, though.
that's what I am saying...
Here is my understanding of Ifeffit, but I am sure Matt can elaborate. Background removal uses the integer part of dk*dr*2/pi+1 to determine the number of knots. Fitting uses dk*dr*2/pi as a real number to determine Nidp. In any case, that's what Artemis reports when you ask it how many independent points in a project. My memory is that I checked it against Ifeffit's report of Nidp.
Not sure I fully follow, as I am not talking about background removal, but in any case, shouldn't the ratio between chi^2 and reduced-chi^2 be an integer number, whichever? Plus, I have found a few documents in which Matt reports Nidp as 2dkdr/pi, some others in which he reports 2dkdr/pi+1. In SK's thesis, which is available on the net (thanks Shelly :-)) she says +2. I was simply wondering which is the right formula used in IFEFFIT, and if it is different from what reported in Stern, Phys. Rev. B, 1993, 48, 9825-9827, why it is so. Stefano -- ____________________________________________ Stefano Ciurli Professor of Chemistry Laboratory of Bioinorganic Chemistry Department of Agro-Environmental Science and Technology University of Bologna Viale Giuseppe Fanin, 40 I-40127 Bologna Italy Phone: +39-051-209-6204 Fax: +39-051-209-6203 "Fatti non foste a viver come bruti, ma per seguir virtute e canoscenza" Dante Alighieri - Inferno - Canto XXVI "Ihr seid bestimmt, nicht Tieren gleich zu leben, Nein, Tugend zu erringen und Erkenntnis" "Ye were not form'd to live the life of brutes, But virtue to pursue and knowledge high"