Hi Steffen MInuit is described in class TMinuit. See: http://root.cern.ch/root/htmldoc/TMinuit.html Concerning the statistical interpretation of the errors, there are two references to the two Fred James books: For a discussion of basic concepts, such as the meaning of the elements of the error matrix, or setting of exact confidence levels see: 1.F.James. Determining the statistical Significance of experimental Results. Technical Report DD/81/02 and CERN Report 81-03, CERN, 1981. 2.W.T.Eadie, D.Drijard, F.James, M.Roos, and B.Sadoulet. Statistical Methods in Experimental Physics. North-Holland, 1971. I am ccying your mail to Fred (he might be away for a few days) and also to Matthias Winkler who is working on a new version of Minuit. Rene Brun On Thu, 5 Jun 2003, Steffen Grohmann wrote: > Hello, > > I need to know the statistical meaning of the errors of fitted > parameters in Minuit, when the fit works without problem. Are these > errors equal to the standard deviation (square root of the mean square > deviation of fitted parameters from the mean of the fitted parameter), > meaning that 63 % of the values fall within the error margin? > > Unfortunately, the link on the TMinuit web page doesn't work > http://root.cern.ch/root/html301/H1Bibliography.html > > Regards, > Steffen >
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