3D linear fit and chi2 square

Roofit and RooStats
1

Dear all,

I need to fit sets of 3 data points in 3D. What would be the fastest way to perform? Because I have to repeat this operation thousands of times. And is there any function in ROOT providing the chi2 or something related to the fit?

Thanks for your help,

Diego

2

Hi,

If you need to do a linear fit , probably the fastest is to use the Linear Fitter class.
An example is this one

https://root.cern.ch/doc/master/fitLinear2_8C.html

Since you have 3D points, another possibility is to fill a TGraph2D and use the TGraph2D::Fit

Otherwise you can extend this circle fit,
https://root.cern.ch/doc/master/fitCircle_8C.html

to the linear one.

Lorenzo

3

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