hi ROOT people,
i am just wondering if there is an easy way to get the error of a fit.
i'm fitting something like this (for example)
ffgr = new TGraphErrors(imax, x, y, dx, dy);
ffgr->Fit(func,"","",xmin,xmax);
TF1 *fitfunc;
fitfunc = ffgr->GetFunction(func);
so once i have the fitting function, i know how to get parameters,
chi^2, parameter errors, etc. what i want is the estimated error on the
function itself so i can draw an error band. i've seen a lot of stuff
in ROOTtalk about how to get the covariance matrix, so i can do that to
calculate the error myself from the covariance matrix, but it seems like
there must be something like
ffgr->GetError(x), or ffgr->EvalError(x), or whatever
to get the error as calculated from the covariance matrix so i don't
have to do all the work myself. any ideas?
thanks,
jason
This archive was generated by hypermail 2b29 : Thu Jan 01 2004 - 17:50:13 MET