see documentation of TGraph::Fit http://root.cern.ch/root/htmldoc/TGraph.html#TGraph:Fit Rene Brun On Sun, 1 Aug 2004, Stilianos Kesisoglou wrote: > Hi, > > I was wondering, which is the method implemented for the assignment of > errors in > the TGraphErrors class? The above class accepts errors on both x and y, so > how > exaclty the errors are combined for the fit? I assume there is a chi^2 > function like: > > [ y-f(x) ]**2 [ y-f(x) ] > ------------------ or ( -------------- ) **2 > s**2 s > > What is the s in the above expressions? > > Thanks! > > Stelios. >
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