Dear all,
I have been trying to fit some data points with a straight line (as shown in the attached plot). The points were fitted against [0]*x + [1] and I got parameter [0] = -1E-03. However, the error I got for this parameter is 5.04E-04 which is 50% of the parameter!! But as shown in the plot, the fitted straight line goes through all the points and it seems that the data points are fitted beautifully, thus I do not understand why the error is so large. Can anyone explain ROOT’s fitting algorithm and why the error is so large?
Thank you in advance for your help!
Ayumi